Guy of Thouars

Guy of Thouars (died 13 April 1213) was the third husband of Constance, Duchess of Brittany. Guy served as regent of Brittany between 1203 and 1206 for his infant daughter Alix, Duchess of Brittany.

In 1196 Constance had been imprisoned by her second husband Ranulph de Blondeville, 4th Earl of Chester. However, the Bretons rose in revolt to protest her imprisonment and Ranulph was forced to release her. Ranulph and Constance divorced in 1199. Once home in Brittany, she married in September or October 1199, Guy of Thouars, an Occitan noble, in Angiers.

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.

Constance died due to complications during the delivery of her twin daughters in 1201.

Once Duke Arthur I died in 1203, he was succeeded by his infant maternal sister, Alix of Thouars. Once his infant daughter inherited the throne, Guy of Thouars became regent of Brittany.

In 1206, however, Philip II of France took the regency of Brittany himself, much to the consternation of the Breton nobles. The young Arthur had already sworn fealty to Philip as king in 1199; Philip now chose this opportunity to exert direct influence in Brittany.

In 1213 Philip II of France arranged for Alix of Thouars to marry Peter of Dreux. That same year Guy of Thouars died in 1213 and was buried at Villeneuve Abbey, Nantes with his wife.