Balearic Islands having partitioned his domains between his sons in his will. The will created a new Kingdom of Mallorca from the Balearic islands and the mainland counties of Roussillon or Montpellier, which was left to his son James II. However, the terms of the will specified that the new kingdom be a vassal state to the Kingdom of Aragon, which was left to his older brother Peter. Chafing under the vassalage, James joined forces with the Pope Martin IV and Philip III of France against his brother in the Aragonese Crusade, leading to a 10-year Aragonese occupation before the islands were
Ibiza (Parliament of the Balearic Islands constituency) with Ibiza counting for 12 out of 13 seats of the Council—11 out of 12 from 1983 to 1987—. From the 2007 election onwards, a separate election is held, also having both Ibiza and Formentera independent Councils, the Ibiza Island Council electing 13 members. Additionally, on 3 April 1979 the first independent election for the Ibiza and Formentera Island Council was held, electing 12 councillors, 11 of them from Ibiza. The constituency was created as per the Statute of Autonomy of the Balearic Islands of 1983 and was first contested in the 1983 regional election. The Statute provided for the