Though each of the Twelve Apostles has his own Feast day, on this day they are commemorated together. Of the Twelve, only St John the Theologian died in peace; the rest met a martyr's end. Following are their individual feast days and the manner of their end.
Roman citizens could not be crucified: crucifixion was considered a shameful death unworthy of a citizen. For this reason the Apostle Paul was 'privileged' to be beheaded.
Peter: June 29, January 16. Crucified upside down.
Andrew: November 30. Crucified.
James the Son of Zebedee: April 30. Beheaded.
John the Theologian: September 26, May 8. Died in peace in a wondrous way.
Philip: November 14. Crucified.
Bartholomew: June 11, August 25. Crucified, then flayed and beheaded.
Thomas: October 6. Pierced with five spears.
Matthew the Evangelist: November 16. Burned to death.
James the Son of Aphaeos: October 9. Crucified.
Thaddeus (or Jude the brother of James): June 19. Crucified.
Simon the Zealot: May 10. Crucified.
Matthias: August 9. Stoned, then beheaded with an axe when dead.
Paul: June 29. Beheaded.