• Born: Montlhéry, Essone, Ile-de-France, France
• Married (2): Bef 1086
• Died: 1108, Rochefort-en-Yvelines, Yvelines, Ile-de-France, France

  Research Notes:

The Historia of Monk Aimon names "Milonem de Brayo et Guidonem Rubeum, Comitissam quoque Reiteste, et Bonam-vecinam de Pontibus, Elizabeth etiam uxorem Joscelini de Corteciniaco, insuper dominam de Puisat, et dominam de S. Galerico" as the children of "Guidonem" and his wife. "Guido de Monte Leterico eiusque uxor Hodierna" donated property to Notre-Dame de Longpont by charter dated to [1061], witnessed by "Wido filius eorum, Adam vicecomes...". "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 [1070]. "Wido filius Widonis de Leuteriomonte" donated property to the abbey of Saint-Martin des Champs by charter dated [1085]. "Dominus Guido de Firmitate et uxor eius Adeleisda" donated their rights "in tota terra Steoville et Boschelt et Alben" to Notre-Dame de Paris by charter dated to [1085].

Comte de Rochefort-en-Yvelines before 1095. Châtelain de Châteaufort et de Gometz. Seigneur de Crècy-en-Bray, de Gournay-sur-Marne et de Bréthencourt. Albert of Aix records that "…Milo…de Braio, Wido pariter rufus capite…" joined with the Lombard contingent on the second wave of the First Crusade, dated to late 1100 from the context.

Seneschal of France 1104/06. Suger's Vita Ludovici records that "Guido Rubeus filiusque eius Hugo Creciacensis…fratri Corboilensi Odoni" rebelled during the reign of Louis VI King of France.

The necrology of Longpont records the deaths “VII Id Mar” of “Guido comes” and "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.