Guillaume de Chartres (Guillielmus de Carnoto, Willemus de Carnoto), Prince of the Cistercian Principality of Seborga, was a grand master of the Knights Templar 1210 – 26 August 1218. In 1210, he assisted at the coronation of Jean de Brienne as King of Jerusalem. In 1211, he arbitrated between Leo II of Armenia and the Templars, regarding the castle of Bagras. During his rule, the order flourished in Spain, achieving important victories against the Moors. Guillaume died of pestilence, (possibly endemic typhus), secondary to being wounded during the siege of Damietta, in Seborga in the Holy Land.
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| Preceded by Phillipe de Plessis |
Grand Master of the Knights Templar 1210–1218 |
Succeeded by Pedro de Montaigu |
