sentences:  Tension began in 1963 when Makarios proposed thirteen amendments to the constitution of the Republic of Cyprus.Turkish Cypriots were opposed to the proposal since they viewed it as an attempt to remove their constitutional safeguards that Greek Cypriots had claimed to be problematic in the conduct of government.On 21 December 1963, clashes between Greek Cypriots and Turkish Cypriots erupted unleashed a wave of violence across the island.