Socialist Party of the Islands of the Valencian Country (PSPV), part of the Socialist Coordination of the Catalan Countries. Ahead of the 1977 general election, PSI created an alliance together with MSM and MSEF, joining the People's Socialist Party (PSP) in the Socialist Unity (US) coalition. US did not gain any seat in the Congress nor in the Senate in the Balearic Islands constituency. After the election, PSI refused to merge with the Balearic federation of the Spanish Socialist Workers' Party, and instead founded the Socialist Party of Majorca (PSM). Socialist Party of the Islands Socialist Party of the Islands (Catalan: "Partit Socialista de les
Balearic Islands at 30,000. The part of the Mediterranean east of Spain, around the Balearic Isles, was called "Mare Balearicum", or "Sinus Balearicus". The Vandals under Genseric conquered the Islands sometime between 461 and 468 during their war on the Roman Empire. However, in late 533 or early 534, following the Battle of Ad Decimum, the troops of Belisarius reestablished control of the islands for the Byzantine Empire. Imperial power receded precipitately in the western Mediterranean after the fall of Carthage and the Exarchate of Africa to the Umayyad Caliphate in 698, and in 707 the islands submitted to the terms of