This is the anniversary of the storm in the North Sea that struck the coasts of Zeeland and Holland in 1421 and created floods that took the lives of some 10,000 people over the following days.

See - http://www.history.com/this-day-in-history.do?action=tdihArticleCategory&id=52204&HPF_rid=36892318&HPF_mid=3053_T1_Url12 for more information.