Frederick IX of Denmark (1899-1972).
During Nazi Germany's occupation of Denmark, Frederick acted as regent on behalf of his father from 1942 until 1943.
Frederick became king on his father's death in early 1947. During Frederick IX's reign, Danish society shook off the restrictions of an agrarian society, developed a welfare stateand, as a consequence of the booming economy of the 1960s, women entered the labour market. Denmark modernized, bringing new demands on the monarchy and Frederick's role as a constitutional monarch. Frederick IX died in 1972, and was succeeded by his eldest daughter.
Before he became king, he had acquired the rank of rear admiral and he had had several senior commands on active service. He acquired several tattoos during his naval service.
In addition, with his great love of music, the king was an able piano player and conductor.
In the 1910s, his mother considered the two youngest daughters, Grand Duchess Maria Nikolaevna of Russia and Grand Duchess Anastasia Nikolaevna of Russia, of her cousin Tsar Nicholas II as possible wives for Frederick until the subsequent execution of the Romanov family in 1918. In 1922, Frederick was engaged to Princess Olga of Greece and Denmark, his second cousin. They never wed.
Instead, he married Princess Ingrid of Sweden in 1935. They had three daughters.
He died from a heart attack.