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 >
To weary shepherds sleeping,
A blinding light appeared;
And from their couches sleeping,
They scattered, all afeared;
But Gabriel spake to calm them
From all that did alarm them.