Who is Queen Mary Tudor from The Virgin's Lover and what is their importance?

Queen Mary Tudor was King Henry VIII's first daughter, whose succession to the throne was disputed by King Henry because he wanted his later wives to take the throne. Queen Mary, however, was the first child of King Henry's first wife, and thus deemed by the Catholic Church and half of the country as the rightful heir to the throne. Queen Mary Tudor, later known as Bloody Mary, was set aside by King Henry as he married and divorced and remarried several times. This led to a lifelong enmity between Queen Mary and the rest of the Tudor descendants.