Christians, awake, salute the happy morn , p. 231, ii. Through the kindness and courtesy of Mr. Walter F. Browne, Acting Librarian of Chetham's Library, Manchester, we are enabled to give the following additional information concerning this hymn:—
Anent this hymn, "Christians, awake," the Master of Peterhouse [Cambridge] says, in vol. 34 of the Chetham Society's Publications, 1895, The Poems of John Byrom, 4 vols., vol. ii., Sacred Poems, Part i., p. 19:—
"The Chetham Library at Manchester preserves in the Librarian's room, carefully framed, the original manuscript of this famous hymn. The title is ‘Christmas Day for Dolly.' The verses were therefore designed by Byrom as a Christmas gift to his daughter Dorothy (born April 26, 1730, died unmarried, September 19, 1797). . . In a letter dated October 12, 1886, the late Mr. J. E. Bailey writes:—'I lately got an original broadside copy of Christians, Awake, most likely printed by Orion Adams, Smithy Door (Manchester). It has a woodcut, and is very carefully printed, showing, I think, that Byrom corrected it. The paraphrase, Hebrews i., is printed in another column beside the Christmas Hymn. It is stitched up with Adams's Manchester Weekly Paper for 1751. As on Christmas Eve, 1750, the organist "Wainwright and the singing men and boys of the old church came before Byrom's door to sing the hymn, this may be the date of its composition and sudden popularity."
It has been said that the poem appeared in Harrop's Manchester Mercury for 1746. On this point Mr. Browne says:—
"I have not a copy of Harrop's Manchester Mercury for 1746 in our library, but a former librarian conveyed the following information to me:—'This hymn was written in 1745 and printed in Harrop's Manchester Mercury in 1746.'"
From Dr. W. E. A. Axon's Annah of Manchester, 1886, p. 88, we find that the first number of Harrop's Manchester Mercury is dated March 3, 1752. This is conclusive against the printed date of the hymn being 1746. There is in the Manchester Free Reference Library an undated broadside containing Byrom's two Christmas hymns, "Christians! awake," and "God Who at sundry times in divers ways," which is regarded as the first printed copy of these hymns, but being without date it is of little value in determining the year in which the "Christmas Day for Dolly" was written. From the evidence before us the earliest date we can give to the hymn is 1750. Wainwright's tune, to which it was sung by his choir as noted above, is known by the varying names of "Yorkshire," "Stockport," and "Mottram."
--John Julian, Dictionary of Hymnology, New Supplement (1907)