William married Helen Of DENMARK between 1200 and 1202. Helen (daughter of Valdemar I King Of DENMARK and Sophia Of POLOTSK) died in 1233. [Group Sheet] [Family Chart]
Henry married Matilda Of ENGLAND on 01 Feb 1168 in Cathedral Chruch in Minden. Matilda (daughter of Henry II 'Curtmantle' King Of ENGLAND and Eleanor Of AQUITAINE) was born in 1156 in London, Middlesex, England; died on 28 Jun 1189 in Brunswick, Germany; was buried in St. Blasius, Braunschweig, Germany. [Group Sheet] [Family Chart]