his refusal to comply with the pope's injunctions led to a renewal of the war. frederick landed in calabria, where he seized several towns, encouraged revolt in naples, negotiated with the ghibellines of tuscany and lombardy, and assisted the house of colonna against pope boniface. in the meanwhile james, who received many favours from the church, married his sister yolanda to robert, the third son of charles ii. unfortunately for frederick, a part of the catalan-aragonese nobles of sicily favoured king james, and both john of procida and roger of lauria, the heroes of the war of the vespers, went over to the angevins, and the latter completely defeated the sicilian fleet off capo d'orlando. charles's sons robert and philip landed in sicily, but after capturing catania were defeated by frederick, philip being taken prisoner (1299), while several calabrian towns were captured by the sicilians.