Mezue ahịrịokwu na-esonụ: William bụ nwa Albert nke Mbụ nke Bavaria na Margaret nke Brieg. William, onye ya na ndị Hooks jikọrọ aka, nọ na
ya na nna ya na-ese okwu ruo n'afọ 1394. N'afọ 1404 ọ nọchiri ya dị ka Count nke Holland, Hainaut na Zeeland na Duke nke Bavaria-Straubing.