William IV Chatelain de , Seigneur de Fa St. Omer

William IV Chatelain de , Seigneur de Fa's father was William III , Chatelain de St. Omer St. Omer and his mother was Mathilde UNKNOWN.  His paternal grandparents were William II , Chatelain de St. Omer St. Omer and Melisinde De Pecguigny.  He was an only child.  He died in 1191 in Palestine.

‌William IV Chatelain de , Seigneur de Fa and Ida were married in a religious ceremony in 1171.  They had a son named I, Herr von Bootien.