King Constantine II of Greece was the last reigning monarch of the Kingdom of Greece. He reigned from 1964 to 1973, when he was deposed in a military coup. He was the second son of King Paul and Queen Frederica of Greece. During his reign, Greece experienced a period of
From Wikipedia
Constantine II was the last king of Greece, reigning from 6 March 1964 until the abolition of the Greek monarchy on 1 June 1973.