for a few years sicily enjoyed peace, and the kingdom was reorganized. however, on the descent of the emperor henry vii, holy roman emperor into italy, frederick entered into an alliance with him, and in violation of the pact of caltabellotta made war on the angevins again (1313) and captured reggio. he set sail for tuscany to cooperate with the emperor, but on the latter's death he returned to sicily. robert, who had succeeded charles ii in 1309, made several raids into the island, which suffered much material injury. a truce was concluded in 1317, but as the sicilians had helped the north italian ghibellines in the attack on genoa, and frederick had seized some church revenues for military purposes, pope john xxii excommunicated him and placed the island under an interdict (1321) which lasted until 1335. an angevin fleet and army, under robert's son charles, was defeated at palermo by giovanni da chiaramonte in 1325, and in 1326 and 1327 there were further angevin raids on the island, until the descent into italy of the next holy roman emperor louis the bavarian distracted their attention. the election of pope benedict xii (1334), who was friendly to frederick, promised a respite; but after fruitless negotiations the war broke out once more, and chiaramonte went over to robert, owing to a private feud.