Christian X of Denmark
Märtha was born at her parents' home of Arvfurstens Palats in Stockholm on 28 March 1901, the second child of Prince Carl of Sweden, Duke of Västergötland, and his wife Princess Ingeborg of Denmark. Her father was the younger brother of King Gustav V of Sweden, making her a first cousin twice removed of the present King of Sweden, and her mother was the younger sister of King Christian X of Denmark and of King Haakon VII of Norway.