Glaucius and Mark, if by only legend where employed in recording the records of Peter, in Alexandria, around 44 C. E. (See Works of Henry Barclay Swete, 1835-1917.) Glaucius, according to Clement was "master of Basilides and interpreter of Peter. ("Stromata, VII, Ch. XXVII.) http://www.meetingpoint.org/~swete/index.htm?head.html~henry