According to the Acts, Genesius addressed Emperor Diocletian and called on him to embrace Christianity:
I came here today to please an earthly Emperor but what I have done is to please a heavenly King. I came here to give you laughter, but what I have done is to give joy to God and his angels. From this moment on, believe me, I will never mock these great mysteries again. I now know that the Lord Jesus Christ is the true God, the Light, the Truth and the Mercy of all who have received his gift of baptism. O great Emperor, believe in these mysteries! I will teach you, and you will know the Lord Jesus Christ is the true God.”
Prayer of St. Genesius
There is no King but Him whom I have seen. I adore and worship Him, and
for His sake, even though I be slain a thousand times, I will always be
His. Torments are not able to take Christ from my mouth, nor from my
Heart. Bitterly do I regret that I detested His Holy name in Holy men,
and came so late, like a haughty soldier, to adoring the true King.
Amen.
From the Fraternity of St. Genesius and Wikipedia
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