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
Death of the Virgin Mary of Košátky broader circle of paintings executed in a similar way, such as the Vyšší Brod Altarpiece, the Kaufmann Crucifixion and the panels of the Morgan Collection (the "Small Morgan Panels"). The panel was probably originally the wing of a diptych, the second part of which was the Wrocław Holy Trinity. In the quality of its execution, the picture ranks among the finest known works dating from the 14th century. It is at the same time the most Italian work of the entire Bohemian school. The construction of space reveals that the artist was acquainted with the central Italian painting of Siena