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
Perugia Altarpiece panels portray scenes of the "Life of St. Nicholas" <br> Perugia Altarpiece The Perugia Altarpiece (Italian: "Pala di Perugia") is a painting by the Italian early Renaissance painter Fra Angelico, housed in the Galleria Nazionale dell'Umbria of Perugia, Italy. The painting was executed for the St. Nicholas Chapel in the Basilica of San Domenico, Perugia. In the early 19th century, it was split and partially dispersed, and some of the predella panels were acquired by the Pinacoteca Vaticana. In Perugia were executed copies of these panels, enclosed into a neo-Gothic frame. The polyptych also included some small depictions of saints,