This is the oldest surviving portrait of Augustine, The best attempt to document the iconographic history of Augustine's
reputation is now Schnaubelt and Van Fleteren, Augustine in
Iconography: History and Legend (New York: Peter Lang 1999). An
excellent
website now offers a wide variety of Augustinian images,
emphasizing late medieval and Renaissance.
I have collected here a few items that have
come my desultory way on the Internet as well.
Gozzoli's cycle of frescoes of the life
of Augustine
From the Netherlands, treasured copy of
City of God.
"Bilder und
Texte zum Leben des hl. Augustinus": text in German but containing
some interesting photographs.
From the University of Wisconsin/Milwaukee, an online "rare book
exhibit" featuring rare
editions of A.'s works.
from the Lateran in Rome in the sixth century.
"The Buddha of
Light"
-- a surviving representation from medieval China of the prophet Mani
disguised as the Buddha. (Click on the small version for larger image.)