Commemorated May 21
Troparion of Ss. Constantine and Helen, Tone 8
O Lord, thy disciple Emperor Constantine, who saw in the sky the Sign of Thy Cross, accepted the call that came straight from Thee, as it happened to Paul, and not from any man. He built his capital and entrusted it to Thy care. Preserve our country in everlasting peace, through the intercession of the Mother of God, for Thou art the Lover of mankind.
Kontakion of Ss. Constantine and Helen, Tone 3
Today Constantine and Helena his mother expose to our veneration the Cross, the awesome Cross of Christ, a sign of salvation to the Jews and a standard of victory: a great symbol of conquest and triumph.