Diptych triptych form, with two outer panels that could be closed across the main central representation. They are one type of the multi-panel forms of painting known as "polyptychs". The diptych was a common format in Early Netherlandish painting and depicted subjects ranging from secular portraiture to religious personages and stories. Often a portrait and a Madonna and Child had a leaf each. It was especially popular in the 15th and 16th centuries. Painters such as Jan van Eyck, Rogier van der Weyden, Hans Memling and Hugo van der Goes used the form. Some modern artists have used the term in
Santa Maria dei Fossi Altarpiece Santa Maria dei Fossi Altarpiece The Santa Maria dei Fossi Altarpiece is a 1496-1498 painting by Pinturicchio, now in the Galleria nazionale dell'Umbria in Perugia. Unusually for an altarpiece, it is painted on canvas stretched over wooden panels. It was commissioned for the high altar of the church of Santa Maria degli Angeli in Perugia, also known as Santa Maria dei Fossi. The contract for the work is dated 14 February 1496 and contains detailed instructions for its production and for its wooden frame by Mattia di Tommaso da Reggio, which imitated the architecture of the church's facade. The painter