John Fisher was an English bishop and theologian born in 1469. He is best known for his strong opposition to King Henry VIII's separation from the Catholic Church. Fisher was a prominent advocate for the Catholic Church and was later appointed as the Bishop of Rochester. In 1535, Fisher was imprisoned for refusing to accept Henry VIII as the Supreme Head of the Church of England. He was executed for treason, becoming a martyr for his faith. Fisher was canonized as a saint by the Catholic Church in 1935, and his feast day is celebrated on June 22.