Lift up your heads, O you gates, be lifted up, you ancient doors, that the King of glory may come in.@Psalm 24:7
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John M. Neale (1818-1866)

John M. Neale, in Ancient Christmas Carols, by E. Sedding, 1860.

Day of Glory French carol melody, harmonized by Charles Wood in The Cowley Carol Book (London: A. R. Mowbray & Company, 1902), number 37 (🔊 pdf nwc).

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Charles Wood (1866-1926)

A day, a day of glory!
A day that ends our woe!
A day that tells of triumph
Against our vanquished foe!
Yield, summer’s brightest sunrise,
To this December morn:
Lift up your gates, ye princes,
And let the child be born!

With Gloria in excelsis
Archangels tell their mirth:
With Kyrie elëyson
Men answer upon earth:
And angels swell the triumph,
And mortals raise the horn,
Lift up your gates, ye princes,
And let the Child be born.

He comes, His throne the manger;
He comes, His shrine the stall;
The ox and ass His courtiers,
Who made and governs all:
The House of Bread His birth-place,
The Prince of wine and corn:
Lift up your gates, ye princes,
And let the child be born.

Then bar the gates, that henceforth
None thus may passage win,
Because the Prince of Israel
Alone hath entered in:
The earth, the sky, the ocean
His glorious way adorn:
Lift up your gates, ye princes,
And let the child be born.