Costas Simitis, a former prime minister of Greece who oversaw his country’s entry into the euro single currency and its uneven preparations for the 2004 Olympic Games, died on Sunday at a hospital in Corinth, Greece. He was 88.
Grigoris Karpouzis, the hospital’s director, confirmed his death in a statement but did not give a cause. The Greek government declared four days of national mourning for Mr. Simitis, who will receive a state burial.
A low-key politician who proved popular with voters, Mr. Simitis demonstrated more sympathy for capitalism and the United States than some of his predecessors as prime minister.