From prison, More spoke out strongly against Henry VIII’s marriage, calling the King’s Act of Supremacy “contrary to the laws of God and his holy Church.” More explained that no temporal prince could take away the prerogatives that belonged to St. Peter and his successors, according to the words of Christ. Although most of the English bishops had accepted the king’s order, More stood his ground, insisting that the saints in heaven did not accept it.
On July 7, 1535, after fifteen months of imprisonment, More was beheaded. Calm before his executioner, he declared, “I am the king’s good servant—but God’s first.”
Kathy includes in her post More’s famous (and faith-instructive) letter to his daughter Margaret, which was written during his imprisonment and is always worth re-reading.
Or, if you’d prefer, you can listen to me read it, here