Born in Bayeux, Guillaume was the brother of Alain Chartier.

[1] Twelve years later he was France's ambassador to the Council of Mantua, at which delivered a speech in Latin which lasted over two hours.

During the League of the Public Weal era he joined the mécontents.

He held onto his bishopric until his death, but Louis XI of France recorded his hostility on Chartier's tomb[2] - that epitaph was later replaced by a more honourable one.

This article about a French Catholic bishop or archbishop is a stub.