Equal of the Apostles and Emperor Constantine with his Mother Helen - Troparion & Kontakion
Troparion — Tone 8
Having seen the image of Your Cross in the heavens, / like Paul you did not receive your call from men. / O Lord, Your Apostle among kings, the Emperor Constantine, / has placed the Imperial City in Your hand; / always preserve it in peace, through the intercessions of the Theotokos, O only lover of mankind.
Kontakion — Tone 3
Today Constantine and his mother Helen / reveal the precious Cross, / the weapon of the faithful / against their enemies. / For our sakes, it has been shown to be a great sign, and fearsome in battle.