d. 400 Feastday: January 1
Also called Telemachus, a martyr and hermit who died in a Roman arena. He lost his life for protesting against the inhuman practice of having gladiators fight to the death for entertainment. During one of the events, Almachius entered the arena in Rome and demanded an end to the barbaric custom. He was promptly stoned to death by an irate crowd. His actions prompted Emperor Honorius to put end to the gladiatorial duels across the Roman Empire.
Theodoret of Cyrus, The Ecclesiastical History
Book V, Chapter XXVI: Of Honorius the Emperor and Telemachus the monk.
"Honorius, who inherited the empire of Europe, put a stop to the gladitorial combats which had long been held at Rome. The occasion of his doing so arose from the following circumstance. A certain man of the name of Telemachus had embraced the ascetic life. He had set out from the East and for this reason had repaired to Rome. There, when the abominable spectacle was being exhibited, he went himself into the stadium, and stepping down into the arena, endeavoured to stop the men who were wielding their weapons against one another. The spectators of the slaughter were indignant, and inspired by the triad fury of the demon who delights in those bloody deeds, stoned the peacemaker to death.
When the admirable emperor was informed of this he numbered Telemachus in the number of victorius martyrs, and put an end to that impious spectacle