Prince Andrew of Greece and Denmark (January 20, 1882 - December 3, 1944), of the House of Schleswig-Holstein-Sonderburg-Glücksburg, was the son of George I (1845-1913), King of the Hellenes, and of Grand Duchess Olga Konstantinova (1851-1926) of Russia.

As he grew up he was taught English by his nannies, so in conversations with his parents he mostly spoke English. He was better at learning to speak Greek than his siblings.

Prince Andrew married HSH Princess Alice of Battenberg in a civil wedding on October 6, 1903 at Darmstadt and in a religious wedding the next day in the Russian Chapel, Darmstadt. Princess Alice was a daughter of Their Serene Highnesses, Prince and Princess Louis of Battenberg. As such Princess Alice was a great grand-daughter of Queen Victoria and in the line of succession to the British throne.

Their children were:

1. Margarita (1905-1981)
2. Theodora (1906-1969)
3. Cecilie (1911-1937)
4. Sophie (1914-2001)
5. Philip (born 1921), later Duke of Edinburgh and husband of Queen Elizabeth II of the United Kingdom.

After a coup d'état in Greece in 1922 Prince Andrew faced charges of treason and his family fled into exile in France. During this time the family became more and more torn apart, Alice and her daughters eventually settling in Germany separated from Andrew, and Philip wound up being taken care of by his relatives in the United Kingdom. Andrew went to Monte Carlo, Monaco and died there, twenty years later.

Alice became a Greek Orthodox nun in 1944 following her husband's death. She suffered a nervous breakdown and was institutionalized in Switzerland, emerged and founded (in 1949) the Christian Sisterhood of Martha and Mary, an order of nuns tending the poor and sick on the island of Tinos in Greece. She sheltered Jewish families in Greece and was posthumously honored for heroism by Israel.