On this day in 1964, King Constantine II of Greece married the Danish Princess Anne-Marie (two weeks after her 18th birthday). Constantine II was the only son of King Paul and Princess Friederike of Hanover, while Princess Anne-Marie was the youngest daughter of King Frederick IX of Denmark and Princess Ingrid of Sweden.
It was the first, and to date only, wedding of a Greek monarch whilst they sat on the throne. The wedding took place at the Metropolitan Cathedral of Athens.
The couple, third cousins, first met in 1959 when then-Crown Prince Constantine accompanied his parents on a state visit to Denmark. Princess Anne-Marie was just 13 at the time. They met again in 1961, and in 1962, Anne-Marie was a bridesmaid at the wedding of Constantine’s older sister, Princess Sophia.