Charles I of Anjou (1225-85), brother of St Louis, was one of the most controversial figures of thirteenth-century Europe. A royal adventurer, who carved out a huge Mediterranean power block, as ruler of Provence, Jerusalem and the kingdom of Naples as well as Anjou, he changed for good the political configuration of the Mediterranean world - even though his ambitions were fatally undermined by the revolt of the Sicilian Vespers. Jean Dunbabin's...