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.