Britain offered to cede the island to Greece in 1915 in return for Greece joining the allies in World War I, but the offer was refused.[17] Turkey relinquished all claims to Cyprus in 1923 with the Treaty of Lausanne, and the island became a British Crown colony in 1925.[18] In 1929, a Greek Cypriot delegation was sent to London to request enosis but received a negative response.[19] After anti-British riots in 1931, the desire for self-government within the British Commonwealth developed, but the movement for enosis became dominant.[20]