Facts and Events
Guy of Thouars (died 12 April 1213) was the third husband of Constance, Duchess of Brittany, whom he married in 1199 in Angiers, County of Anjou on or after 18 April 1199 when her son Arthur of Brittany entered Angers to be recognized as count of the three countships of Anjou, Maine and Touraine. He was an Occitan noble, a member of the House of Thouars.
Guy and Constance had two daughters, Alix of Thouars and Katherine, Dame of Vitre, in 1201. Constance died in childbirth.
Between 1198 and the time of her death delivering twin daughters, Constance acted as regent for her young son Arthur I, Duke of Brittany. Constance had abdicated her ducal throne in Arthur's favour in 1194. When Duke Arthur I died in 1203, he was succeeded by his infant maternal sister, Alix of Thouars. Guy served as Regent of Brittany for his infant daughter Alix, Duchess of Brittany from 1203 to 1206.
In 1204, Guy de Thouars as regent of Dutchess Alix, vassal of the Philip II, King of France, undertook the siege of the Normans island fortress of Mont Saint-Michel. Because the abbey would not surrender, he set fire to the village and massacred the population. He was obliged to beat a retreat under the powerful walls of the abbey. Unfortunately, the fire which he himself lit extended to the buildings, and the roofs fell prey to the flames. Philip II paid Abbot Jordan for the reconstruction cost.
In 1206 Philip II took the regency of Brittany himself, much to the consternation of the Breton nobles.