St. Lucia's flood (Sint-Luciavloed) was a storm tide that affected the Netherlands and Northern Germany on December 14, 1287 (the day after St. Lucia Day) when a dike broke during a storm, killing approximately 50,000 to 80,000 people in the fifth largest flood in recorded history. Much land was permanently flooded in what is now the Waddenzee and IJsselmeer. It especially affected the north of the Netherlands, particularly Friesland. The city...