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This article deals with the 12^th century Knight Templar. For the 16^th century Huguenot, see Philippe de Mornay.

coat of arms of Philipe de Plessis

Phillipe de Plessis (1165 – 1209) was the 13th Grand Master of the Knights Templar. He was born in the fortress of Plessis-Macé, Anjou, France. In 1189 he joined the Third Crusade as a simple knight, and discovered the Order of the Temple in Palestine. After the death of Gilbert Horal he became Grand Master. He helped uphold the treaty between Saladin and Richard I. In the renewal of this treaty in 1208 he suggested that the Teutonic Order and Hospitallers should make a new peace treaty offer with Malek-Adel. The accord was criticised by Pope Innocent III.

There were few military actions during his rule; the Fourth Crusade never arrived in the Holy Land. The German King was in opposition to the Knights regarding the Gastein stronghold. The Templars were initially expelled from Germany, but the pope intervened in the dispute.

Relations with the Hospitaliers were tense. During his rule the Order of the Temple reached its greatest height in Europe.

His name is last documented in 1209. The Obituary of Reims gives the date of his death as November 12, 1209.