In 1302, Charles of Valois came down into Italy at the behest of Pope Boniface. He landed in Sicily, but his army was ravaged by the plague and forced to sue for peace. On 19 August, the Peace of Caltabellotta was signed and Frederick was recognised as king over Sicily, with the title of "King of Trinacria". Charles was recognised as king over the peninsula, with the title of "King of Sicily", usually rendered by historians as "King of Naples," for such was his capital. In May 1303, the pope ratified the treaty and Frederick paid him tribute. Marriage was arranged between Frederick and Charles' daughter Eleanor.