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.

St. Anthony's Fire

Victims of ergotism by Peter Bruegel

Diagnosing medieval diseases has its difficulties. Modern research must rely on accurate recording of symptoms and knowledge of potential causes. And yet, we manage to estimate the likeliest causes of the ailments of long-gone centuries.

Geoffroy du Breuil of Vigeois was a Benedictine who recorded events from 994-1184 in his Chroniques. He mentions preparations for the First Crusade and the Cathar heresy. He also talks about an outbreak in France of an illness that caused rampant gangrene. This is believed to be a case of St. Anthony's Fire.

St. Anthony's Fire was so-called because it was most successfully treated by monks of the Order of St. Anthony. The order was founded in 1095 by Gaston of Valloire and his son, because the son had been cured from the symptoms by the relics of Saint Anthony the Great. The symptoms of St. Anthony's Fire were not only gangrene that caused limbs to fall off but also convulsions, diarrhea, psychosis, headaches, nausea, vomiting, and an uncontrollable itching feeling.

Now we equate St. Anthony's Fire with ergotism, caused by the fungus Claviceps purpurea which infects rye, barley, and other grains. Ergotism also explains a plague in 857, mentioned in the Annales Xantenses. It is also a proposed explanation for anecdotes of bewitchment found in the Middle Ages and later, including in Puritan New England.