Guy X de Laval, was born circa 1295, the eldest son of Guy IX, Seigneur de Laval et de Vitré, and his wife, Béatrix de Gavre.
Possible daughter Jeanne de Laval, Abbess de Saint-Georges de Rennes
Seigneur de Laval et de Vitré. m (2 Mar 1315) BEATRIX de Bretagne, daughter of ARTHUR II Duke of Brittany & his second wife Yolande de Dreux Ctss de Montfort l'Amaury (7 Dec 1295-9 Dec 1384, bur Abbaye de Clermont near Laval).
He was killed in Battle at La Roche-Derrien on 18 June 1347
See also: Cawley, Charles & Foundation of Medieval Genealogy, 'Maine & Vendôme: Chap. 7B. Seigneurs de Laval (Montmorency)', version 3.4, 29 June 2016, in Medieval Lands: A prosopography of medieval European noble and royal families, http://fmg.ac/Projects/MedLands/index.htm : viewed 8 October 2016.
Contributeurs de Wikipédia, "Bataille de La Roche-Derrien," Wikipédia, l'encyclopédie libre, http://fr.wikipedia.org/w/index.php?title=Bataille_de_La_Roche-Derrien&oldid=130016913 (Page consultée le octobre 9, 2016).
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L > Laval | D > de Laval > Guy (Laval) de Laval
Categories: Maison de Montmorency-Laval
i) ANNE de Laval (1385-Vitré 20 Jan 1486, bur Laval Saint-Tugal). m firstly (contract 15 and 22 Jan 1405) JEAN de Montfort, son of --- (-Rhodos 12 Aug 1414). He succeeded in 1406 as GUY [XIII] Seigneur de Laval et de Vitré. m secondly (1416) JEAN Turpin, son of --- (-after 1432).
m (1286) BEATRIX van Gavre Vrouwe van Gavre, Dame de Chièvres, daughter of RASO [XI] van Gavre & his wife Beatrix van Strijen (-4 Jul [1316]). Guy [IX] & his wife had children: 1. GUY [X] de Laval (-killed in battle la Roche-Derrien 18 Jun 1347). Seigneur de Laval et de Vitré. m (2 Mar 1315) BEATRIX de Bretagne, daughter of ARTHUR II Duke of Brittany & his second wife Yolande de Dreux Ctss de Montfort l'Amaury (7 Dec 1295-9 Dec 1384, bur Abbaye de Clermont near Laval). "Yolent Duchesse de Bretaigne Contesse de Montfort, Jehan de Bretaigne fil, damoiselles Jehanne, Beatrix et Aelis filles feu Artur Duc de Bretaigne et de lad. Duchesse, Bouchart Conte de Vandosme, Jehan de Vandosme son frere, Bouchart de Vendosme Seigneur de Bonneval et Thibaut de Danisy Seigneur de Boolon" were present at the marriage contract between led. Conte de Vendosme and lad. damoiselle Aelis, dated Aug 1320[590]. Dame de Hédé. Guy [X] & his wife had three children: