Margaret Tudor

Margaret Tudor (28 November 1489 – 18 October 1541) was Queen consort of Scotland from 1503 until 1513 by marriage to James IV of Scotland and then, after her husband died fighting the English, she became regent for their son James V of Scotland from 1513 until 1515.
She was born at Westminster Palace as the eldest daughter of King Henry VII of England and Elizabeth of York.
Margaret Tudor had several pregnancies, but most of her children died young or were stillborn. As queen dowager she married Archibald Douglas, 6th Earl of Angus. Through her first and second marriages, respectively, Margaret was the grandmother of both Mary, Queen of Scots, and Mary's second husband, Lord Darnley. Margaret's marriage in 1503 to James IV linked the royal houses of England and Scotland, which a century later resulted in the Union of the Crowns. Upon his ascent to the English throne, Margaret's great-grandson, James VI and I, was the first person to be monarch of both Scotland and England after Elizabeth I died childless.