Barbara Castle, Baroness Castle of Blackburn

Barbara Anne Castle, Baroness Castle of Blackburn,, was a British Labour Party politician who was the Member of Parliament for Blackburn from 1945 to 1979, making her the longest-serving female MP in the history of the House of Commons until that record was broken in 2007 by Gwyneth Dunwoody. She later became the Member of the European Parliament for Greater Manchester from 1979 to 1989 and subsequently a member of the House of Lords, having been granted a life peerage in 1990. She was the only woman to hold the position of First Secretary of State.