Elizabeth II is the constitutional monarch of 16 Commonwealth realms. She was born in 1926 and educated privately. During World War II, she joined the women's auxiliary territorial service. In 1947, she married Prince Philip of Greece and Denmark. During her reign, she oversaw the transition of the British Empire to the Commonwealth. She has 4 children and many grandchildren. Elizabeth is patron to over 600 charities and enjoys equestrianism, dogs, and photography in her spare time.