At the age of twelve he married the formidable Blanche of Castile and they became the parents of ten children. In 1212 he took Saint Omer and Aire as he regarded Flanders too powerful and too near his own county of Artois. In 1216 the English King John offered him the English throne in exchange for support against the powerful English barons. Louis went to England to support the rebels but, after initial success, was defeated at sea. In 1217 peace was signed and Louis was secretly paid 10,000 marks. In 1223 he succeeded his father as King of France and, in 1224, seized Poitou. In 1226 he launched a successful crusade against the Albigensian heretics, capturing the major fortress of Avignon before returning towards Paris because of illness. He died at Montpensier shortly afterwards. 
 

Source: Leo van de Pas