Altarpiece two, three, and multiple panels respectively. In the thirteenth century each panel was usually surmounted with a pinnacle, but during the Renaissance, single panel, or "pala", altarpieces became the norm. In both cases the supporting plinth, or "predella" often featured supplementary and related paintings. If the altar stands free in the choir, both sides of the altarpiece can be covered with painting. The screen, retable or reredos are commonly decorated. Groups of statuary can also be placed "on" an altar. A single church can furthermore house several altarpieces on side-altars in chapels. Sometimes the altarpiece is set on the altar
Diptych of Philip de Croÿ with The Virgin and Child Diptych of Philip de Croÿ with The Virgin and Child The Diptych of Philip de Croÿ with The Virgin and Child consists of a pair of small oil-on-oak panels painted c. 1460 by the Netherlandish artist Rogier van der Weyden. While the authorship and dating of both works are not in doubt, it is believed but not proven that they were created as wings of a devotional diptych and that at some unknown time the panels were broken apart. A diptych panel fitting the description of the Mary wing was described in a 1629 inventory of paintings owned by Alexandre