A collection of popes have had violent deaths through the centuries. The circumstances have ranged from martyrdom (Pope Stephen I)[1] to war (Lucius II),[2] to a beating by a jealous husband (Pope John XII). A number of other popes have died under circumstances that some believe to be murder, but for which definitive evidence has not been found.
Pope Sixtus II (Saint), elected 30 August 257 and martyred 6 August 258[4]
Pope Dionysius (Saint), elected 22 July 259 after year of persecutions and died 26 December 268, martyred[4]
Pope Felix I (Saint), elected 5 January 269 and died 30 December 274, martyred[4]
Pope Eutychian (Saint), elected 4 January 275 and martyred 7 December 283[4]
Pope Caius (Saint), elected 17 December 283 and martyred 22 April 296 but not at hands of his uncle Diocletian[4]
Pope Marcellinus (Saint), elected 30 June 296 and martyred 25 October 10 during persecution of Diocletian[4]
Pope Marcellus I (Saint), elected 27 May 308 after 4-year vacancy and martyred 16 January 309[4]
Pope Eusebius (Saint), elected 18 April 309 and martyred in Sicily 17 August 309.[4][9]
Pope John I (Saint), elected 13 August 523, during the Ostrogothic occupation of the Italian peninsula. Was sent as an envoy by Ostrogoth king Theodoric the Great to Constantinople. Upon return, Theodoric accused John I of conspiracy with the Byzantine empire. Imprisoned and starved to death on 18 May 526.[4]
Pope Martin I (Saint) Elected in 649. Died in exile 16 September 655.
Pope Pius I (Saint) (c. 142 – c. 154), martyred by the sword according to old sources.[18] Claim of martyrdom removed from the 1969 General Roman Calendar after recent revisions.[19]
Celestine V (1294–1296), allegedly murdered while in post-abdication captivity. Allegations blame his successor, Pope Boniface VIII.[21]
Boniface VIII (1294–1303), Was in conflict with Philip IV of France and allegedly (though unlikely) died from the effects of ill-treatment one month before.[22]
^Mann, H. (1910). Pope John VIII. In The Catholic Encyclopedia. New York: Robert Appleton Company. Retrieved February 14, 2010 from New Advent: http://www.newadvent.org/cathen/08423c.htm