Thomas Howard, 4th Duke of Norfolk (1536–1572), was a prominent English nobleman during the Tudor period. He was a member of the Howard family, one of the most influential families in England. The Duke was known for his involvement in the political intrigues of the time, particularly concerning the Mary, Queen of Scots and her claim to the English throne. As a leading figure in the Catholic faction, the Duke faced significant challenges during the Protestant Reformation. His ambition led to his involvement in plots against Queen Elizabeth I, which ultimately resulted in his execution for treason. His life reflects the turbulent political landscape of 16th-century England.