From The Synaxarion:
The Martyrs Akindinos, Pegasias, Anempodist were courtiers of the Persian emperor Sapor II (310-381), and clandestinely they were Christians. When the emperor started his persecution against Christians, envious pagans denounced them before him. Summoned to the emperor for trial, the holy martyrs fearlessly confessed their faith in the Holy Trinity. The emperor gave orders to beat them with whips. Twice the exhausted executioners switched places, but the holy martyrs let out neither a cry nor a groan. Even the emperor could not endure the strain and he lost consciousness. Everyone thought him dead. But the saints appealed to God, and the emperor came to himself. And having recovered, Sapor accused the saints of sorcery and gave orders to take the holy martyrs over a bonfire, so as to suffocate them with the smoke. But by the prayers of the saints the fire extinguished, and the ropes binding them sundered. When the emperor asked them how this had occurred, the holy martyrs told him about Christ working the miracle. Blinded by rage, the emperor began to blaspheme the Name of the Lord. Then the saints exclaimed: "Let thy mouth be speechless," and the emperor lost his voice. Having gone mad with terror and rage, he tried with gestures to give the order to take away the holy martyrs to prison. Those round about were not able to understand him, and he began to go into an even greater rage: madly plucking off his mantle, he tore at his hair and beat himself upon the face. Saint Akindinos took pity on him and in the Name of the Lord delivered him from the speechlessness. But this time the emperor attributed everything to magic and he continued the torture of the saints. They placed them upon an iron grate and lighted a fire beneath it. The saints started to pray. Suddenly it rained and put out the fire. Beholding the miracle accomplished through the prayers of the holy martyrs, many people believed in Christ and confessed their faith. The saints glorified God and called on the believing to accept Baptism by the rain sent down upon them.
One of the executioners, Aphthonios, publicly asked forgiveness of the holy martyrs for causing them suffering, and he bravely went to execution for Christ. The dignitary Elpidiphoros and even the mother of the emperor confessed faith in the One True God. The emperor saw how much the number of Christians was increased and how the torturing of Saints Akindinos, Pegasias and Anempodist actually encouraged the Christian faith. He declared to the people that the holy Martyrs Akindinos, Pegasias, Anempodist and Elpidiphoros with them would have their heads cut off, and that their bodies could not be taken by Christians for burial. When they led the holy martyrs beyond the city walls for execution, a tremendous crowd accompanied them, glorifying Christ. By order of the emperor, soldiers massacred all the Christians (about 7,000) in the procession. Together with the others also was killed Elpidiphoros.
Akindinos, Pegasias, and Anempodist together with the mother of the emperor were burnt on the following day. Christians, coming secretly by night to the place of the execution of the saints, found the bodies of the holy martyrs unharmed by the fire and with reverence they buried them.
Troparion of the Martyrs - Tone 2
Blessed is the earth which drank your blood
holy the abode which received your spirits.
You conquered the enemy in the stadium and preached Christ with boldness.
Beseech Him to save our souls,
for He is good, O victorious Martyrs.
Kontakion of the Martyrs - Tone 4
Thou didst receive the God-bearing Martyrs Acindynus,
Pegasius, Anempodistus, Aphthonius and Elpidephorus,
into the enjoyment of Thy goodness and repose,
for they abandoned all things on earth for Thee,
O only Good One.