Greek–Turkish relations regime, there were periodic crises with Turkey, which suspected that the Greek regime was planning a pro-unification coup in Cyprus. A 1971 Turkish law nationalized religious high schools, and closed the Halki seminary on Istanbul's Heybeli Island which had trained Greek Orthodox clergy since 1844. On July 15, 1974, a band of Greek Cypriot nationalists formed EOKA B, advocating Enosis (Union) with Greece and, backed by the Greek military junta in Athens, staged a coup against the Cypriot President and Archbishop Makarios. An ex-EOKA man, Nikos Sampson was appointed President. On July 20, Turkey—using its guarantor status arising from the
Turkish invasion of Cyprus territory of the Republic of Cyprus. The occupation is viewed as illegal under international law, amounting to illegal occupation of European Union territory since Cyprus became its member. The invasion's Turkish Armed Forces code name was Operation Atilla. Among Turkish speakers the operation is also referred as "Cyprus Peace Operation" () or "Operation Peace" () or "Cyprus Operation" (), as Turkey took military action on the pretext of a peacekeeping operation. In 1571 the mostly Greek-populated island of Cyprus was conquered by the Ottoman Empire, following the Ottoman–Venetian War (1570–1573). After 300 years of Ottoman rule the island and its