Unto Us a Boy Is Born

Unto us a Boy is born,
King of all creation:
Came He to world forlorn,
Lord of every nation.

Cradled in a stall was He
’Midst the cows and asses;
But the very beasts could see
He all men surpasses.

Herod then with fear was filled:
“A prince,” he said, “in Jewry!”
All the little boys he killed
At Bethl’em in his fury.

Now may Mary’s Son, who came
Long ago to love us,
Lead us all with hearts aflame
To the joys above us.

Omega and Alpha He!
Let the organ thunder,
While the choir with peals of glee
Rends the air asunder.

Author: Unknown

Year: 1600

This is an English translation of the 15th-century Latin carol 'Puer nobis nascitur'. The original Latin author is unknown; the most common English version was translated by Percy Dearmer (1867–1936) for the 1928 Oxford Book of Carols. The given lyrics closely match Dearmer's translation, but the query asks for the author of the words/lyrics of the presented hymn, which is traditionally treated as anonymous in its Latin form.