Guy of Thouars

Between 1196 and the time of her death in 1201, while delivering twin daughters, Constance ruled Brittany with her young son, Arthur I, as co-ruler.

Arthur's elder full sister Eleanor, was captured along with him and imprisoned by John.

Arthur was succeeded by his infant half-sister, Guy's daughter Alix of Thouars.

In 1204, Guy as regent of Duchess Alix, vassal of Philip II of France, undertook the siege of the Norman island fortress of Mont Saint-Michel.

[c] Guy died in 1213 in Chemillé in the county of Maine, and was buried with Constance at Villeneuve Abbey, now in the commune of Les Sorinières, outside of Nantes.