In some hymnals, the editors noted that a hymn's author is unknown to them, and so this artificial "person" entry is used to reflect that fact. Obviously, the hymns attributed to "Author Unknown" "Unknown" or "Anonymous" could have been written by many people over a span of many centuries. Go to person page >
We bless Thee for Thy peace, O God. [For Peace of Heart.] This popular hymn was given anonymously in the American Christian Melodies, 1858, the Songs of the Church, 1862, Songs of the Sanctuary, 1865, and subsequently in many English collections, including Horder's Worship Song, 1905.
--John Julian, Dictionary of Hymnology, New Supplement (1907)
Composed by Alexander R. Reinagle (b. Brighton, Sussex, England, 1799; d. Kidlington, Oxfordshire, England, 1877), ST. PETER was published as a setting for Psalm 118 in Reinagle's Psalm Tunes for the Voice and Pianoforte (c. 1836). The tune first appeared with Newton's text in Hymns Ancient and Mode…