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
San Luca Altarpiece the figures and the "azzurro Todesco" (a blue pigment derived from copper) with which to inlay them. The work was completed within that or the following year. The polyptych is located in Pinacoteca di Brera, Milan. San Luca Altarpiece The San Lucas Altarpiece, also known as the San Lucas Polyptych, is a polyptych panel painting by Northern Italian Renaissance painter Andrea Mantegna. The altarpiece is a polyptych panel painting featuring 12 figures each in his or her own arch. The seven figures in the top row flank the central figure of Jesus Christ. The five beneath flank Saint Luke. On