Guillaume de Champvent

His church career in England, being a dean of St. Martin's Le Grand in London from 1262.

[1] His influence at court in 1262 is evidenced by his joining the Savoyard witness list for a charter relating to Queen Alianor’s dowry.

[2] Upon his departure back to Lausanne Edward I of England would appoint Louis I of Vaud to St. Martin's Le Grand[3] He was elected Bishop of Lausanne in 1273, he initiated a vigorous policy of restoring the rights of his Church, which set him against Savoy and the bourgeoisie of Lausanne, a policy he led by relying on the Empire.

He built the episcopal castles of Bulle and Lucens;[4] he acquired that of Glérolles.

In 1275 took place the consecration of the Lausanne Cathedral by Pope Gregory X.