William I , Seigneur de Montmirail&Authon Gouet

William I , Seigneur de Montmirail&Authon was born about 1005 in Autun,Saone-et-Loire,Bourgogne,France.  He died before 1064 in Montmirail,Sarthe,Maine/Pays-de-la-Loire,France.

‌William I , Seigneur de Montmirail&Authon and Matilda (Mahaut) de were married in a religious ceremony in 1st husband.  They had a son and a daughter, named William II , Seigneur de Montmirail and Hildeburge.