Seigneur Guy I DE DAMPIERRE Viscount of Troyes
- Born: Troyes, Aube, Champagne, France
- Married: Between 1120 and 1125
- Died: 1151, Dampierre, Aube, Champagne, France
The Continuation de l’Histoire d’Aimonus names "matrem Simonis de Breiis, matrem Guidonis de Dominapetra, matrem Hugonis de Planceio, matrem Milonis de Erucio, matrem Salonis vicecomitis Senonensis" as the daughters of "Milo [de Brayo, frater Guidonis Rubei]". His parentage is indicated by the charter dated to  under which his maternal uncle "Milo de Monte Leterico" donated a serf to Notre-Dame de Longpont for the soul of "fratris sui Guido Troselli", witnessed by "Guido nepos eius de Domna Petra…".
Seigneur de Dampierre, de Saint-Dizier et de Moeslain. Vicomte de Troyes . [“Willelmus de Teliciaco” consented to the donation of “terra Ulduni” to Fontemoy abbey by “dominus Landricus de Praiaco” by charter dated to [1130/34] “in aula...domini Widonis Montisregali domini”. It is likely that the last-named was the second husband of Helvide de Baudémont, acting as seigneur de Montréal during the continued minority of her son by her first marriage.] "Ansericus de Monteregio" donated property to Pontigny, with the support of “--- uxor eiusdem Anserici”, by charter dated 1145, witnessed by “Andreas de Baldament, Bernardus capellanus de Monteregio, Guido de Dompetræ et Guido filius eius...Garnerius de Dompetræ...”
Guy married Helvide DE BAUDÉMENT, daughter of André DE BAUDÉMENT Sénéchal de Champagne and Agnès DE BRAINE Dame de Braine, between 1120 and 1125. (Helvide DE BAUDÉMENT was born in Baudemont, Val-de-Oise, Ile-de-France, France and died in 1165.)