Guy I "Troussel" DE MONTLHÉRY, châtelain de Rochefort-en-Yvelines 1
- Born: Montlhéry, Essone, Ile-de-France, France
- Died: 24 Jul 1095, Longpont, Picardie, France
- Buried: abbaye de Longpont, Aisne, France
Compiler's 30 x great-grandfather
seigneur de Montlhéry et de Bray, La Ferté-Alais (en partie),Châtelain de Rochefort-en-Yvelines, Bréthencourt, Chevreuse et Châteaufort 1
The Historia of Monk Aimon names "Guidonem" as the son of "Theobaldus cognomina Filans-stupas, Forestarius [Roberti Regis]" stating that he held "Montem-Lethericum".
Seigneur de Montlhéry. He founded the priory of Longpont : Geoffroy Bishop of Paris confirmed that "noster miles...Guido" founded the church of Notre-Dame de Longpont, under the abbey of Cluny, by charter dated to . "Guido de Monte Leterico eiusque uxor Hodierna" donated property to Notre-Dame de Longpont by charter dated to , witnessed by "Wido filius eorum, Adam vicecomes...". "…Guido de Monte Letheri…" witnessed the charter dated 29 May 1067 under which Philippe I King of France confirmed the possessions of Saint-Martin-des-Champs. "Guido de Monte Leherico" donated property to Notre-Dame de Longpont, confirmed by "filii mei Milo et Guido et conjux mea Hodierna", by charter dated to , witnessed by “...Aymo vicecomes...”.
He became a monk at Longpont.
The necrology of Longpont records the death "IX Kal Aug" of "Guido institutor hujus loci. Guido vicecomes; Adalaidis comitissa, uxor; Wido filius eius", a supplementary section adding a further reference to the anniversary of “donni Guidonis senioris hujus loci institutoris et Guidonis comitis filii eius...IX Kal Aug” as well as the anniversary of “donne Hodierne uxoris ipsius Guidonis senioris et Ermensendis de Sancto Galarico filie amborum...VII Kal Apr” with a reference to her visit to Cluny where “beato Hugoni abbati” gave her “calicem...aureum”. 2
Guy married Hodierne DE GOMETZ LA FERTÉ, daughter of Guillaume DE GOMETZ, Seigneur de la Ferté-Baoudin, and Alberède?. (Hodierne DE GOMETZ LA FERTÉ was born in Bures, Yveline, Île-de-France, France and died on 26 Apr 1095 in La Ferté-Alais, France.)