Charles I, King Of England, Scotland And Ireland
Yes, I'm a Catholic and this is a Catholic blog! I know Charles was an Anglican heretic, but he was married to a devout Catholic, produced two (not so devout) Catholic sons and died for what he sincerely believed was the Catholic Faith. He was a model Prince who was judicially murdered by republicans, much like our own Martyred King, His Most Christian Majesty, Louis XVI. Check out the Wikipedia article on him and the website of the Society of King Charles the Martyr. Anglican in inspiration, it accepts Catholic members and, indeed, has an «independent» Catholic Priest on its board.