The position of King of Arms of the Order of the Garter, usually known as Garter King of Arms, was created sometime around 1415, and Bruges appointed to it. His father's will, dated July 1415, refers to William Bruges as both Guyenne and Garter King of Arms. After this, the next mention of Bruges in the position is 13 September 1417. It was the first time a king of arms had been specifically appointed for the service of an order of chivalry. By virtue of this office, he held permanent authority over the provincial kings of arms.