Troparion for St Catherine:

By your virtues as by rays of the sun you enlightened the unbelieving philosophers, and like the most bright moon you drove away the darkness of disbelief from those walking in the night; you convinced the queen, and also chastised the tyrant, God-summoned bride, blessed Catherine.

You hastened with desire to the heavenly bridal chamber of the fairest Bridegroom Christ, and you were crowned by Him with a royal crown; standing before Him with the angels, pray for us who keep your most sacred memory.