Person Name: Servus Dei Author of "Saviour, to Thee my all I now surrender" in The Song Companion to the Scriptures 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.
Anonymous