Mary Queen of Scots was indeed a threat to Queen Elizabeth. Mary Queen of Scots was formally the Queen of Scotland, but after her husband died, she was made to give up the throne for her son, James. After being arrested for having a recent affair with her husband, she fled to England, where she thought her cousin, Elizabeth, would look after her. Just being in England, Mary Queen of Scots became a threat to Elizabeth. Mary Queen of Scots was a threat to Queen Elizabeth, by her own belief in religion, the possibility of an illegal marriage between Henry VIII and Anne Boleyn, and by attempting to kill Queen Elizabeth.

Mary Queen of Scots threatened Queen Elizabeth with religion. The persecuted Protestants saw Elizabeth as their savior, since she came up with "the new faith." Queen Elizabeth had a belief that if someone was a Catholic and...