Guillaume de Gisors
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Guillaume de Gisors (1219–1307) was a Norman lord and knight.<ref name=":0">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref name=":1">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> He was the son of Hugues III de Gisors and grandson of Jean de Gisors.
Life
A 1256 document identifies him as the Lord of Gisors.<ref name=":0" /> He had fiefdom over Meulan.<ref name=":1" /> He received fief from Matthew II of Montmorency.<ref name=":1" />
He presented a candidate for the cure of Saint-Éloi-près-Bézu to Eudes Rigaud, the Roman Catholic Archbishop of Rouen.<ref name=":0" />
In conspiracy theories, such as the one promoted in The Holy Blood and the Holy Grail, Guillaume de Gisors is alleged to have been a Grand Master of the Priory of Sion.<ref>Template:Cite news</ref>