Costas Simitis, Greece's former prime minister, passed away in a Corinth hospital at the age of 88 on Sunday.
The cause of death has not been disclosed, but the Greek government declared four days of national mourning.
Simitis, noted for his support of capitalism and U.S. relations, had the longest uninterrupted term of any modern Greek prime minister.
His leadership was marked by significant milestones, including Greece's adoption of the euro in 2001 and the preparations for the 2004 Summer Olympics.
The aftermath of these achievements contributed to a serious debt crisis, prompting discussions about Greece's future in the European Union.
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