Constantine II reigned as the last King of Greece, from 6 March 1964 until the abolition of the monarchy on 1 June 1973.
Constantine is the only son of King Paul and Queen Frederica of Greece. As his family was forced into exile during the Second World War, he spent the first years of his childhood in Egypt and South Africa. He returned to Greece with his family in 1946 during the Greek Civil War. King George II died in 1947, and Constantine's father became the new king, making Constantine the crown prince.
He acceded as king in 1964 following the death of his father, King Paul. Later that year he married Princess Anne-Marie of Denmark with whom he eventually had five children. Although the accession of the young monarch was initially regarded auspiciously, his reign saw political instability that culminated in the Colonels' Coup of 21 April 1967. The coup left Constantine, as the head of state, little room to manoeuvre since he had no loyal military forces on which to rely. As a result, he reluctantly agreed to inaugurate the junta on the condition that it be made up largely of civilian ministers.