Prince Andrew of Greece and Denmark (Ανδρέας; Andreas; – 3 December 1944) of the House of Schleswig-Holstein-Sonderburg-Glücksburg, was the seventh child and fourth son of King George I of Greece and Olga Constantinovna of Russia. He was a grandson of Christian IX of Denmark and the father of Prince Philip, Duke of Edinburgh. He was a prince of Greece and Denmark, both by virtue of his patrilineal descent.
A career soldier, Prince Andrew began military training at an early age, and was commissioned as an officer in the Greek army. His command positions were substantive appointments rather than honorary, and he saw service in the Balkan Wars. In 1913, his father was assassinated and Andrew's elder brother Constantine became king. Constantine's neutrality policy during World War I led to his abdication, and most of the royal family, including Andrew, was exiled. On their return a few years later, Andrew saw service as Major General in the Greco-Turkish War (1919–1922), but the war went