Its official Catalan name is Eivissa; Ibiza is the Spanish (Castilian) name, now less used in Spain itself, though still dominant among speakers of English.
The island was conquered by James I of Aragon in 1235.
Ibiza is a very popular tourist destination, especially due to its legendary riotous nightlife (mainly in Ibiza Town, the island's capital on the eastern shore).
Eivissa, Cala de sa Galera, with the Puig Nunó in the background