Prime Minister Costas Simitis (died at 88) belonged to which country?

Explanation

– Costas Simitis, who died at age 88, was the former Prime Minister of Greece.
– He served as Greece’s Prime Minister from 1996 to 2004, leading the country during its adoption of the euro currency.
– His tenure focused on modernizing Greece’s economy and its integration into the European Union.
– He led the PASOK party during his time as Prime Minister.