William III Count of Hainault & Holland

William III Count of Hainault & was born in 1280.  William III Count of Hainault &'s father was John II Count of Hainault & Holland and his mother was Philippine of Luxemburg.  His paternal grandparents were John Count of Hainault and Aleidis Countess of Holland; his maternal grandparents were Henry V The Blind Count of Luxemburg and Margaret of Bar. He had a sister named Margaret of.  He died at the age of 57 in 1337.

‌William III Count of Hainault & and Jeanne were married in a religious ceremony on May 19th, 1305.  They had a son and three daughters, named William IV Count of, Philippa of, Joan Countess of and Margaret of.