Nyora kupfuurira kweiyi ndima - William akanga ari mwanakomana waAlbert I weBavaria naMargaret weBrieg. William, akabatanidzwa neHooks, akanga achirwisana
nababa vake kusvikira muna 1394. Muna 1404 akamutsiva sa Count weHolland, Hainaut neZeeland uye Duke weBavaria-Straubing.