Otto I, Count of Waldeck

Otto I (c. 1262–1305), youngest son of Henry III of Waldeck, inherited the county in 1275–1276 by marrying Sophia of Hesse, displacing his elder brother Adolf II. He fought for John I of Brabant in the Limburg Succession War and shared the victory at Worringen in 1288.

The victory brought him lands including Volksmarsen and Canstein Castle. He was captured in a feud near Heiligenstadt in 1305 and strangled.