with the King and supported him in his wars in Sweden and the Holy Roman Empire. In 1311 he participated in the magnificent tournament held by King Eric in Rostock. Death Duke Valdemar died in the spring of 1312. He was succeeded as Duke by his son Eric II who had already been his father's coruler for several years. Valdemar was buried in the Schleswig Cathedral. Marriage and Issue In 1287 Duke Valdemar married Elisabeth of Saxe-Lauenburg, a daughter of John I, Duke of Saxony. This marriage produced the only legitimate son of Duke Valdemar: Eric II (c. 1290 – 1325), Duke of Schleswig 1312–1325 In 1306 he married Anastasia of Schwerin, a daughter of Niklot I, Count of Schwerin. Ancestry References Biography in Dansk Biografisk Leksikon 1. ed. Dukes of Schleswig House of Estridsen 1312 deaths 1260s births