St. Lucia's Flood

St. Lucia's Day, commemorating a 4th century martyr, is 13 December. On that date in 1287, one of the largest floods in recorded history took place in the North Sea. A similar flood in 1953 allows us to look back and ascribe the 1287 event to a particularly high tide and a particularly low pressure system. The North Sea rose enough to pour over dikes and seawalls, flooding the Netherlands and North Germany. Estimates put the death rate at 50,000 in Germany alone, 80,000 people in total.

The flood also made permanent changes to the countryside. The term "Zuider Zee" (Frisian "Southern Sea") begins to be used at this time for the body of water that was created by this flood. The Zuider Zee was expanded by the flood on St. Marcellus day in 1362. The area called the Zuider Zee was already a body of water: the freshwater Lake Flevo (also called Almere). The Flood connected it to the North Sea through a flooded forest and turned it into the saltwater Zuider.

Economic and political changes followed the geographical upheaval. The West Frisian city of Stavoren (officially the oldest city in Friesland, having been granted a charter in the 1060s) was a trade center on the bank of a river (the Vlie). The flood built up a sand bank that interfered with its shipping and started its decline. The Zuider also brought the coastline to other cities that promptly took advantage of it. The formerly landlocked city of Harlingen became a new seaport. The province of West Frisia became separated from the rest of Friesland by a strait that was nine miles wide at its narrowest; it was annexed by the County of Holland (a state of the Holy Roman Empire).

The same storm affected England, where the water rose several feet in Norfolk. It was a year of storms and flooding in England. Several months earlier England experienced the South England Flood of 1287. It likewise caused economic changes, as it crippled one of England's chief seaports, Dunwich. Tomorrow we'll see what happened then and there.

Medieval Warm Period, Again

I did mention the Medieval Warm Period in 2012, from the viewpoint of how Greenland must have been warmer than currently. There is, of course, more that can be said.

Also known as the Medieval Climate Anomaly (MCA), research suggests that the warmest decades (about a 50-year span, in fact), occurred at different times in different regions between about 1000 and 1250CE.

Cores taken from sediment in the Sargasso Sea area suggest that the MCA was 1°C warmer. Further sediment cores from the Gulf Coast and Atlantic coastline from New England to Florida show a peak in North Atlantic tropical cyclone activity, consistent with warmer ocean temperatures.

Calling it the "Medieval" Warm Period or Climate Anomaly is, of course, eurocentrism at its finest. Other parts of the world were affected. The climate in Africa was notably drier during this time. Analysis of bones from the Canary Islands shows a drop in temperature of 5°C from the MCA to the later time known as the "Little Ice Age." A study in 2013 found that the water of the Pacific Ocean was 0.9°C warmer in the years in question.

How did it affect daily life and culture is an important question. One belief is that the warmer temperatures benefitted agriculture in Europe, leading to better harvests. This led to healthier individuals and an increase in population. That larger population was more at risk of being culled when disaster struck, such as the Great Famine of 1315-1317.

One other phenomenon the warmer climate might have supported was the Norse colonization of North America, due to less sea ice to deal with, and a convenient stopover at Greenland, but we'll go into that tomorrow. See you then.

The Great Famine of 1315-1317

In 1315, Europe's spring rains never stopped.

The rains kept coming, flooding the fields. Crop failures followed, lasting right through until the summer harvests of 1317. Full recovery took another several years. Hunger and disease devastated the population. People starved; cannibalism is hinted at in records; there is some evidence that parents might have abandoned children to fend for themselves. (The story of Hansel and Gretel may have originated in a famine: the children have been cast out by the parents during a famine.) Records of the city of Bristol report

...such mortality that the living could scarce suffice to bury the dead, horse flesh and dog's flesh was accounted good meat, and some eat their own children. The thieves that were in prison did pluck and tear in pieces, such as were newly put into prison and devoured them half alive. [link]

Harvests were not the only casualty. Marshland that had been reclaimed for crops or grazing was returned to marshland. Constantly wet ground—and a lack of forage—is not good for livestock. Disease killed off cows and sheep. Records from Ramsey Abbey show one manor going from 48 cows to only 2 at this time.

Villages themselves physically suffered. Not only were some abandoned due to dying population and un-tillable soil, but some coastal villages disappeared. The rains and storms reclaimed shoreline communities. One of the wealthiest ports in England, Dunwich, lost almost 300 houses, barns, and shops. 

Of course, prices soared. Edward II stopped at St. Albans on 10 August 1315, and there was not enough bread for him and his entourage; he tried to freeze food prices (in Lorraine, wheat prices rose by 320%), but vendors simply refused to sell for so little, and Parliament overturned the king's decree in 1316. What grain there was was wet, and needed to be dried before using, but it resulted in a poorer quality product. People were forced to consume the grain hey had set aside for planting the following year. Begging and stealing became rampant. Groups of roaming peasants looking for work and food were common, having abandoned their farms and villages.

What caused this weather? Well, like the volcanic winter of c.536, a likely candidate is the 1314 eruption of Mount Tarawera in New Zealand spewing ash into the atmosphere that precipitated rain for two years. Also, this all took place just after the Medieval Warm Period, a three-century span of milder temperatures that were ideal for agriculture; this coincided with a boom in population—a population that could not be maintained when harvests became so poor.

It's been over ten years since I had anything to say about the Medieval Warm Period. I think it's time for another look. See you tomorrow.

Extreme Weather

"Volcanic winter" is a frightening phrase. It is the result of a volcanic eruption that spews so much ash and dust into the atmosphere that it encircles the globe and prevents sunlight from reaching the surface of the Earth. 

A volcanic winter took place in the 530s CE, the most severe drop in temperature in the Common Era. An eruption of sulfate aerosols possibly in late 535 dropped summer temperature averages in 536 by at least 4-5 degrees Fahrenheit. In 539-540, a second volcanic eruption caused summer temperatures to drop another 5 degrees.

This was recorded in the Northern Hemisphere by contemporary writers in Constantinople. Procopius, whose writing revealed the secret of where silk came from, records of 536 

...during this year a most dread portent took place. For the sun gave forth its light without brightness … and it seemed exceedingly like the sun in eclipse, for the beams it shed were not clear."

Cassiodorus, in a letter in 538, describes the sun's rays being weak, no shadows from people at noon, the sun's heat being feeble, the moon "empty of splendor," prolonged frost, unseasonable drought, frosts during harvest, the need to use stored food because harvests were so poor.

The Annals of Ulster mention a failure of bread in the year 536.

Dendrochronology (tree ring analysis) shows very poor growth in Irish oak in 536. Ice cores from Greenland and Antarctica show substantial sulfate deposits around 534±2 years, which offers evidence for the volcanic eruption. Which volcano was the cause, however, has never been agreed upon. The 536 event was worse than 1816, when the explosion of the Mount Tambora volcano caused the "Year Without a Summer."

As mentioned in the prior post, the line regarding the Battle of Camlann in the Welsh Annals that says of 537 "there was great mortality in Britain and Ireland" is likely a reference to the famine that resulted from the volcanic winter.

The 536 event was not the only severe weather crisis in the Middle Ages. Next time, let's jump forward to the Great Famine of 1315-17.

Three Futile Battles

The Welsh Triads are several statements that group things in threes. They can be basic knowledge, such as "There are three primary musical forms, namely: string music; bellows music; and music of the tongue." They can be historical, such as "Three princes of the Court of Arthur. Goronwy son of Echell Fordwyten; and Cadreith son of Porthfaurgaddu; and Fleidur Fflam."

Accordingly, there were "Three Futile Battles of the Island of Britain." They were the Battle of Arfderydd, the battle of Camlann, and the Battle of the Trees. Arfderydd was mentioned in the previous post, because the outcome—the death of Gwenddoleu, ruler of Arfderydd (now Arthuret)—drove his bard Myrddin/Merlin mad, causing him to flee to the forest and live among birds and beasts. This battle is said to have taken place in 573CE, according to the Annales Cambriae, the Annals of Wales.

The Battle of Camlann is also mentioned in the Annales Cambriae, taking place in 537, with very little detail except to call it "strife of Camlann, in which Arthur and Medraut fell, and there was great mortality in Britain and Ireland." Although Medraut is naturally equated to Mordred, there is no clue in the entry that they were enemies.

The Battle of the Trees is a Welsh poem found in a 14th century manuscript, The Book of Taliesin. In it, the Welsh magician and warrior Gwydion enchants the trees to fight as his army against Arawn, lord of the Underworld.

The reason they are called "futile" is because the battles came about because of small, pointless actions. Arderydd is said to have been brought about because of an argument over a lark's nest. The Battle of the Trees comes about when Amaethon, Welsh god of agriculture, steals a dog, a lapwing, and a roebuck from Arawn. Camlann is brought about because of an argument between Gwenhwyfar (Guinevere) and her sister, Gwennhwyfach. Some sources specify this as a slap (hence the illustration above), which became part of another Triad: "The Three Fatal Slaps" or "The Three Harmful Blows of the Island of Britain."

Although this slap, and the hostility between Guinevere and her obscure sister, are not seen outside of Welsh legend, it is interesting that Malory does make Camlann's big battle the result of something "futile": during a parley between Arthur and Mordred, a soldier reflexively draws his sword because he sees a snake in the grass before him. This act causes the opposing side to assume treachery, whereupon they draw their swords, and the fight is on. Something that should be insignificant causes great destruction.

But, as mentioned, the earliest reference to Camlann includes none of this. There were extreme weather events in 535-36 that led to great famine; this could easily have led to fighting between groups struggling for food. Some suggest Camlann was a disastrous cattle raid for food. Next, let's talk about the weather.

The New Church

Explanation of cross-in-square from this fascinating site.

Today is May Day, and the anniversary of the consecration of the Nea Ekklesia [Greek: "New Church"] in 880.

It was built by Emperor Basil I the Macedonian (c.830 - 886). Although he started as a peasant, he advanced politically until he was in a position to usurp the throne of Emperor Michael III in 867. He set out to create a new golden age of Byzantine art, and he wound up being considered one of the greatest Byzantine emperors. In his desire to reproduce the glory of the reign of Justinian I, he started a building campaign. The pinnacle of this campaign was the Nea Ekklesia, which he considered his answer to the magnificent Hagia Sophia.

One of the things that made it "new" was the floor plan, something called "cross-in-square." Typical churches before that time—and, truthfully, after that time as well—were laid out like a cross, longer than they were wide. Nea Ekklesia broke that mold. Byzantine architecture had already shown a preference and flair for domes, and mounting them on a square base with a feature called a pendentive. Nea Ekklesia was a new style that filled out the cross shape by centering it in a square and putting several domes over the four additional sections. (See the illustration above for an example of a standard cross-in-square.)

As important as the Nea was, it was eventually turned into a monastery (called, perhaps predictably, "New Monastery") in the 11th century. After the Ottomans conquered the Byzantine Empire in 1453, the building was used to store gunpowder. It was destroyed in 1490 when it was struck by lightning.

Cold Weather

Okay, it wasn't that bad

Much of the United States is experiencing lower-than-usual temperatures recently—and the forecast is that there is more to come. The people reading this blog have (I hope) ready access to sources of heat and insulated housing, warm clothing and hot drinks, weather-proof shoes and knit hats. But what of folk centuries ago? How much can we know of the weather of past centuries?

A Chronological Listing of Early Weather Events by James A. Marusek (2010) compiles several sources of weather data from numerous historical records. The detail is praiseworthy. Just a sample from the time of and immediately following the Norman Invasion makes me glad I was not living through those years in Europe.

• 1066 A.D. In England, there was a great frost.
• Also refer to the section 1064 A.D. – 1071 A.D. for information on the drought and famine in Egypt during that timeframe.
• Winter of 1067/1068 A.D. The winter in Europe in the year 1067 was long and intensely cold and many people perished by cold and hunger.
• In 1067, the vine and fruit trees in France were killed [by the extreme cold].
• During 1067-68, in France, the winter between St. Brice to St. Gregory (from 13 November 1067 until 12 March 1068) was extremely severe. The vineyards and forest trees bore no fruit. The mishap brought forth by this and the previous years infertility produced in England such a famine, that the unfortunates were forced to eat dog and horse meat, yes, even to eat human flesh.
• In France, a terrible winter began on 13 November 1067 and lasted until 12 March 1068.
• In England in 1068, there was famine and plague after a severe winter.
• 1069 A.D. The rivers froze in the north of Germany.
• In the year 1069 in Germany, the winter was harsh and long. There was a shortage of wine and fruit because of the extreme cold. The rivers were frozen over. King Henry IV came to the countries of the Saxons and caused such carnage that the area was depopulated.
• In 1069, the Normans desolated England, and in the following year famine spread all over England, “so that man, driven by hungar, ate human, dog and horse flesh;’ some to sustain a miserable life sold themselves for slaves.
• [In England in 1069, there was a great dearth. The peasants of the north, unable any longer to secure dogs and horses to appease their hunger, sold themselves into slavery in order to be fed by their masters. All the land between Durham and York were laid waste, without inhabitants or people to till the soil for nine years. Some of the destitute resorted to cannibalism. A factor that contributed to this hardship was the taxes exacted by the conquerors. Peasants became discouraged, realizing that the fruits of their labor were taken from them as fast as they were earned.]

The Annals of Xanten

Yesterday's post on St. Anthony's Fire mentioned the Annales Xantenses, the Annals of Xanten covering 790-873. The manuscript was found in the Cotton Library (as Cotton Tiberius C XI), and assumed to be annals of the Abbey of Xanten on the mouth of the Rhine. Another theory is that it was compiled by Gerward, a 9th century royal historian connected to the monasteries of Lorsch and Ghent.

Either way, it is a depressing account:

845
In that same year the heathen broke in upon the Christians at many points, but more than twelve thousand of [them] were killed by the Frisians. Another party of invaders devastated Gaul; of these more than six hundred men perished. Yet owing to his indolence, Charles ... agreed to give them many thousands of pounds of gold and silver if they would leave Gaul, and this they did. Nevertheless the cloisters of [...] most of the saints were destroyed, and many of the Christians were [led] away captive. 

846
According to their custom the Northmen plundered eastern and western Frisia and burned down the town of Dordrecht, with two other villages, before the eyes of Lothair ..., who was then in the castle of Nimwegen, but could not punish the crime. The Northmen, with their [boats] filled with immense booty, including both men and goods, returned to their own country.At this same time, as no one can mention or hear without great sadness, the mother of all the churches, the basilica of the apostle Peter, was taken and plundered by the Moors, or Saracens, who had already occupied the region of Beneventum. The Saracens, moreover, slaughtered all the Christians whom they found outside the walls of Rome, either within or without this church. They also carried men and women away prisoners. They tore down, among many others, the altar of the blessed Peter, and their crimes from day to day bring sorrow to Christians. Pope Sergius departed life this year.

847
After the death of Sergius no mention of the apostolic see has come in any way to our ears.

848
On the fourth of February, towards evening, it lightened and there was thunder heard. The heathen, as was their custom, inflicted injury on the Christians. [source]

All very sad. Also, not all accurate. Pope Sergius II died 24 January 847 and was succeeded by Pope Leo IV on 10 April 847. The slowness of communication—perhaps exacerbated by the constant invasions from "Northmen" (Norse)—must have made them think that the papacy was left vacant for a longer time than it was.

Black Monday

Today is known in the USA as Black Friday. The term was coined in 1966 to refer to the practice of kicking off the Christmas shopping season with big sales on the day after Thanksgiving, and is "black" because the increased revenue is supposed to lift companies out of red ink and into solvency.* "Black" has been used historically to denote particular days when disaster has struck. There is more than one Black Sunday, and Black Tuesday will forever be linked with the USA stock market crash on 29 October, 1929. The markets crashed again on 19 October, 1987—though not so spectacularly as in 1929. There are also a number of Black Mondays, but I want to focus on two of them.

In The antiquities and history of Ireland (1705) by Sir James Ware and Sir John Davie, we find this:

The occasion of Black-Monday, and the Original remembrance thereof rose at Dublin. The City of Dublin, by reason of some great Mortality, being waste and desolate, the Inhabitants of Bristol flock'd thither to Inhabit, who after their Country manner, upon Holy-days, some for love of the fresh Air, some to avoid Idleness, some other for Pastime, Pleasure, and Gaming-sake, flock'd out of the Town towards Cullen's Wood upon Monday in Easter Week. The Bitanes, Tooles, (the Mountain Enemies) like Wolves lay in Ambush for them, and upon finding them unarm'd, fell upon them, and slew 300 men besides Women and Children, ...

Also called "The Cullenswood Massacre," the event in 1209 was commemorated by Dubliners every year for a few centuries afterward.

Hailstones from a storm in the Philippines

The other Black Monday (in fact, there are several, but I'm talking about the medieval ones) took place in 1360. The Hundred Years War was in a particularly busy phase, and Edward III's forces were all over France. While he was approaching Chartres, a storm of great severity struck his encamped forces on 13 April (Easter Monday that year). It brought thunder, lightning, high winds, hailstones as big as pigeon eggs that dented armor. One report described it as “A foul dark day of mist and hail, and so bitter cold, that sitting on horseback men died.” We are told that 1000 men and 6000 horses died from the storm. According to Froissart, this storm was taken by many of Edward's advisers to be an omen; they convinced him to make peace, and on 8 May the Treaty of Brétigny was first concluded (it was formally ratified months later at Calais).

*Calendar note: given the way Thanksgiving is calculated, today (the 22nd) is the earliest date that Black Friday can take place; the latest is 29 November.