The Frick Collection, New York City

A hypothetical reconstruction of Piero della Francesca’s altarpiece for the church of Sant’Agostino, showing the position of seven of its eight surviving panels. In the top row, from left to right, are Saint Augustine, Saint Michael, Saint John the Evangelist, and Saint Nicholas of Tolentino. In the bottom row are Saint Monica, the Crucifixion, and (possibly) Saint Leonard.