He fought in the campaigns of 1291/92 against the Byzantine Greeks of the Despotate of Epirus, and inherited rule over one half of Thebes from his uncle Otho of Saint-Omer at his death, sometime before 1299.
He participated in the battles of 1291/92 against the Byzantine Greeks of the Despotate of Epirus, and succeeded to rule over one half of Thebes from his uncle Otho of Saint-Omer at his demise, prior to 1299.