After over a century of European ( French , Portuguese ... ) incursions and attempts at conquest , the island was conquered on April 29 , 1483 , after a campaign that lasted 5 years , by the Crown of Castile , with the support of Queen Isabella I , a conquest which turned out to be an important step towards the expansion of the unified Spain .
Gran Canaria was conquered by the Kingdom of Castile in 1483 .