The word Tyro means recruit. As soon as Theodore entered the army in the Marmarite regiment in the town of Amasea, the persecution of Christians began under the Emperors Maximian and Maximus. As Theodore did not try to conceal the fact that he also was a Christian, he was dragged to court and thrown into prison, which was then locked and sealed because the wicked judge wanted him to die of starvation. The Lord Christ Himself appeared to Theodore in prison and encouraged His martyr, saying to him: “Fear not Theodore, I am with you. Do not partake of earthly food and drink anymore, for you will be with Me in the other world in the heavens – eternal and everlasting.” At that moment there appeared a multitude of angels in the prison, and the entire prison shone brightly. The guards, seeing angels dressed in white raiment, became terrified. After that, St. Theodore was taken out, tortured and condemned to death. Theodore was thrown into a fire and gave up his holy soul to the Most-high God. He suffered in the year 306.
Source: St. Nikolai Velimirovic, The Prologue of Ohrid – Volume One.
Great are the achievements of faith! In the fountain of flame, as by the water of rest, the holy Martyr Theodore rejoiced; for having been made a whole-burnt offering in the fire, he was offered as sweet bread unto the Trinity. By his prayers, O Christ God, save our souls.