Aci Castello (Sicilian: Jaci Casteḍḍu) is a comune in the Province of Catania in Sicily, Italy. The city is located 9 kilometres (6 mi) north of Catania on the Mediterranean coast. The primary economic sectors are agriculture and industry (in Catania). The city is neighbored by Aci Catena, Acireale, Catania, San Gregorio di Catania and Valverde.HistoryThe town of Aci Castello developed around the castle, which was built in 1076 by the Normans upon the foundations of a 7th-century Byzantine fortification. In 1169, Aci Castello started to expand after an eruption of Mount Etna made the towns in its vicinity uninhabitable. The castle later became the property of the bishops of Catania.In 1296, Roger of Lauria, admiral of the Aragonese fleet during the War of the Sicilian Vespers, was granted the fief of Aci and its castle as a reward for his faithful service to King Frederick III of Sicily. When relations between the two men soured and di Lauria transferred his loyalties to the Angevins, the castle was besieged and captured by King Frederick and di Lauria stripped of his fiefs. In 1320, the castle and Aci were taken from Roger's descendant, Margaret of Lauria and given to Blasco II de Alagona. Whilst the latter was away defending Palermo from the attacking Angevins, Bertrando di Balzo sacked Aci in his absence.Main sightsThe Norman Castle, which was built from 1076 to 1081. It now serves as a museumThe borough Aci Trezza with a beachReferencesThis article incorporates information from the German Wikipedia.