Treason is the crime of attacking a state authority to which one owes allegiance. This typically includes acts such as participating in a war against one's native country, attempting to overthrow its government, spying on its military, its diplomats, or its secret services for a hostile and foreign power, or attempting to kill its head of state. A person who commits treason is known in law as a traitor.

Catherine Howard, also spelt Katheryn Howard, was Queen of England from 1540 until 1541 as the fifth wife of King Henry VIII. She was the daughter of Lord Edmund Howard and Joyce Culpeper, a cousin to Anne Boleyn, and the niece of Thomas Howard, 3rd Duke of Norfolk. Thomas Howard was a prominent politician at Henry's court, and he secured her a place in the household of Henry's fourth wife, Anne of Cleves, where she caught the King's interest. She married him on 28 July 1540 at Oatlands Palace in Surrey, just 19 days after the annulment of his marriage to Anne. He was 49, and she was between 15 and 21 years old, though it is widely accepted that she was 17 at the time of her marriage to Henry VIII.