The 1421 St.Elisabeth flooding ‘event’ and the loss of “De Groote Waard”, the Netherlands.

According to legend, a very severe storm in November 1421 caused catastrophic flooding and overnight loss of the larger part of “De Groote Waard”, a prosperous polder area in medieval The Netherlands. Allegedly, more than 25 villages were lost and thousands of people were killed. But what had really happened?.