Philippe de Plessis was born in 1165 at the fortress of Plessis-Mace, Anjou, France. In 1189 he joined the Third Crusade to the Holy Land, as a secular knight, and discovered the Order of the Knights Templar, where upon he joined the Order.
With the death of Gilbert Erail in 1200, Plessis became the 13th Grand Master of the Knights Templar in 1201.
He continued Erail’s work, to uphold the treaty between Christian and Muslims, much to the disgust of the then Pope and his legates. In 1208 he suggested that the Teutonic Order and Hospitallers should make a peace treaty with Malek-Adel, which didn’t go down well with Pope Innocent III.
His actions, his words, kept the Knights Templar out of the Fourth Crusade.
Philippe de Plessis died on the 12th November 1209, aged 44 years.