Arouse in Your Church, O Lord, the spirit with which blessed Josaphat, Your Martyr and Bishop, was filled when he laid down his life for his flock; so that, by his intercession, we, also moved and strengthened by the same spirit, may not fear to lay down our lives for our brethren.
Collect, Feast of Saint Josaphat, Martyr (14 Nov, 1962 calendar)
Josaphat was his religious name. His real name was John Kunsevich, born in present day Ukraine and later a Ruthenian Orthodox archbishop in Poland during the 16th century, who lead his archeparchy into union with Rome under the Union of Brest.
His insistence on unity with the pope, not to mention his zeal and asceticism, drew the ire of many enemies. He was so hated, that Orthodox, Protestants, and pagans conspired together to murder him, and they got their wish upon instigating an angry mob on 12 November 1623. He was shot, his skull smashed to bits with axes, wild dogs set upon him, then weighted with stones and thrown into the Dvina river. Catholics would later recover his body, which now resides at St. Peter’s in Rome.
He is a martyr not just for the faith, but specifically for unity with the one true pope, even unto death.
“I rejoice to offer my life for my holy Catholic faith. Grant that I be found worthy, Lord, to shed my blood for the union and obedience to the Apostolic See.” HERE