1 Mary, Queen of Scots(Queen of Scotland (1542 - 1567))
Mary, Queen of Scots was the ruler of Scotland till 24 July 1567. After an uprising against her, Mary sought protection from her first cousin, Queen Elizabeth I of England. However, the Queen perceived her as a threat and kept Mary in confinement for eighteen and a half years. Ultimately Mary was beheaded for plotting to assassinate the Queen.