This feast was established jointly by the Greeks and Russians in the time of the Greek Emperor Manuel and the Russian Prince Andrei, as a memorial of the simultaneous victories of the Russians over the Bulgars and the Greeks over the Saracens. In both battles, the soldiers carried crosses, from which a heavenly radiance shone forth, with the army. It was therefore instituted that, on August 1st, the Cross be carried from the Church of St Sophia, first around the interior of the church and then through the streets, to give the people the chance to venerate it, as a memorial of the miraculous help given by the Cross in earlier wars. This was not just any cross, but the true Precious Cross itself, which was kept in the church of the imperial court. On July 31st, the Precious Cross was taken from the imperial court to St Sophia's, and thence carried through the streets, to consecrate the earth and the air. Finally, on August 14th, it was taken back to the church in the imperial palace.

By the might of Thy precious and life-created Cross, O Christ, have mercy upon us. Amen.