Wilhelm married Jeanne Van Holland, [DUCHESS OF JULI on 26 Feb 1334 in Of, , , HOLLAND. Jeanne (daughter of Guillaume Iii, De Avesnes, [COUNT OF HAINAU and Jeanne De Valois, [COUNTESS OF HAI) was born about 1315 in Of, Le Quesnoy, Nord, France; died in 1374. [Group Sheet] [Family Chart]