Master of St. Augustine
St. Augustine Altarpiece

Bruges, ca. 1490
Oil, oil filding, and silver on oak panel
The Cloisters, New York City

The scene on the left may be Augustine's preaching in Hippo while a priest. According to the Golden Legend (html or pdf), the bishop's mother tongue was Greek and he needed Augustine to preach to the people in Latin.

The central panel appears to depict Augustine's ordination as Bishop of Hippo.

The panel on the right shows Augustine preaching on the Trinity, counting off the number three on his fingers. The upper right shows a story Augustine once told. Walking by the seaside meditating on the Trinity, he saw a boy digging a hole in the sand. The boy told him he was going to put the sea into the hole. When Augustine said it was impossible to put the whole sea into that little hole, the boy replied that it would be easier than understanding the Trinity.

More of St. Augustine