Little is known about Bouchart other than the period during Cyprus' reign under the Templar Grand Master, Robert de Sablé, who, at that period, was not able to leave a huge garrison on Cyprus, as the army was needed to do battle elsewhere.
Each man who held the position of Grand Master of the Knights Templar was the supreme commander of the Poor Fellow-Soldiers of Christ and of the Temple of Solomon (also known as the Knights Templar), starting with founder Hugues de Payens in 1118.
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John and his wife, Alice de Montaigu—who was the niece of the archbishop of Nicosia, of Guerin, Hospitaller grand master, and of Peter, Templar grand master—had one son (perhaps named Eudes), who died in infancy, and several daughters besides Margaret.