Here is a beautiful hymn.  This translation is from my Angelus Press 1962 missal:

The beauteous light of God’s eternal majesty
Streams down in golden rays to grace this holy day,
Which crowned the princes of the Apostles’ glorious choir,
And unto guilty mortals showed the Heavenward way.

The Teacher of the world, and Keeper of Heaven’s gate,
Rome’s founders twain, and rulers, too, of every land,
Triumphant over death by sword and shameful cross,
With laurel crowned are gathered to the eternal band.

O happy Rome! who in thy martyr princes’ blood,
A twofold stream, art washed and doubly sanctified:
All earthly beauty thou alone outshinest far,
Empurpled by their outpoured lifeblood’s glorious tide.

All honor, power, and everlasting jubilee
To Him Who all things made and governs here below,
To God, in essence One, and yet in Persons Three,
Both now and ever, while unending ages flow. Amen.