Prince Valdemar of Denmark (27 October 1858 – 14 January 1939) was a member of the Danish royal family. He was the third son and youngest child of Christian IX of Denmark and Louise of Hesse-Kassel. He had a lifelong naval career. He was paternal uncle of Prince Andrew of Greece and Denmark, father of Prince Philip, Duke of Edinburgh
Prince Axel was born on 12 August 1888, in the Yellow Palace, an 18th-century town house at 18 Amaliegade, immediately adjacent to the Amalienborg Palace complex in Copenhagen. He was the second child of Prince Valdemar of Denmark, and his wife Princess Marie of Orléans.