O Come, Immanuel

I recently found these lines, a translation I was not familiar with, of stanzas of "O Come, Immanuel."

O come, thou Root of Jesse! draw
The quarry from the lion's claw;
From those dread caverns of the grave,
From nether hell, thy people save.

O come, thou Lord of David's Key!
The royal door fling wide and free;
Safeguard for us the heavenward road,
And bar the way to death's abode.

Translated by T. A. Lacey; Latin Author unknown, 12th or 13th Century