the Three Islands"), referring to Corfu, Zante, and Cephalonia. As a result of the two prolonged wars of the 17th century—the War of Candia (1645–1669) and the Morean War (1684–1699)—the office acquired a more permanent nature, and was renamed to Provveditore generale delle Quattro Isole after the capture of Santa Maura in 1684. Authorities in the islands were divided into two types: the Venetian ones, occupied by Venetians and represented the sovereign state and its political and military power over the Islands, and the domestic authorities, which were appointed by the Communal Council (). The Venetians were appointed by the Great Council of Venice. There were three officials constituting the ("regime") of each island. The head of the had the title of in all the islands except for Corfu, where he was called . The title could only be held by a nobleman. The subordinate Venetian officials were the , two on each island, who performed administrative and judicial functions along with the of each island. The s responsibilities also included security from hostile raids, taxation, religious and other issues. In Corfu the Venetian officials included a , a and a , two , a and a . In Cephalonia and Zante there were only one and two . When Lefkada (Santa Maura) was incorporated a was appointed, while the archives also record the occasional appointment of a , although, in 1595, another was appointed to the Fortress of Asso. In Cythera the included both a and a . In imitation of the metropolis, the domestic authorities comprised both a and a composed of members of the local aristocracy. There were ten fortresses throughout the islands, with one on each island serving as its capital. On Corfu, however, there were three fortresses; two in the town of Corfu and the Angelokastro. On Cephalonia there were two, the castle of St. George or the Fortress of Cephalonia () and the Fortress of Asso () in the northern part. Economy The Ionian economy during the Venetian period was largely based on exporting local products. The most important of the agricultural products of Corfu was olive oil. On the islands of Cephalonia and Zante the main exports were raisins, olive oil and wine. One of the most significant exports was olive oil. Groves of olive trees were planted throughout the islands during the Venetian period as olive oil was important to Venice's economy.