Forgive them, O my Father. Cecil F. Alexander. [Good Friday.] Contributed to the revised edition of Hymns Ancient & Modern, 1875, in 6 stanzas of 4 lines, and based on the words "Father, forgive them, for they know not what they do." In 1881 it was repeated in Mrs. Brock's Children's Hymn Book, and is also found in one or two American collections.
--John Julian, Dictionary of Hymnology (1907)