From December 13th to 14th, 1287 the Lucia flood broke over the North Sea coast . The chronicles speak for the German North Sea coast of approx. 50,000 dead and the most severe devastation. Many villages sank in the floods, in East Friesland alone there were over 30, and a preliminary stage to the dollar was formed . As a result of the great loss of land and the relative vulnerability of the march , many people moved from the march to the Geest .
Lucia flood in the weather dictionary at www.dwd.de