Winged altarpiece in the context of "Triptych"

An altarpiece is a painting or sculpture, including relief, of religious subject matter made for placing at the back of or behind the altar of a Christian church. Though most commonly used for a single work of art such as a painting or sculpture, or a set of them, the word can also be used of the whole ensemble behind an altar, otherwise known as a reredos, including what is often an elaborate frame for the central image or images. Altarpieces were one of the most important products of Christian art especially from the late Middle Ages to the era of Baroque painting.

The word altarpiece, used for paintings, usually means a framed work of panel painting on wood, or later on canvas. In the Middle Ages they were generally the largest genre for these formats. Murals in fresco tend to cover larger surfaces. The largest painted altarpieces developed complicated structures, especially winged altarpieces with hinged side wings that folded in to cover the main image, and were painted on the reverse with different simpler images. Often this was the normal view shown in the church, except for Sundays and feast days, when the wings were opened to display the main image. At other times visitors could usually see this by paying the sacristan.

The Elevation of the Cross (also called The Raising of the Cross) is the name of two paintings, a very large triptych in oil on panel and a much smaller oil on paper painting. Both pieces were painted by the Flemish artist Peter Paul Rubens in Antwerp, Belgium, the original in 1610 and the latter in 1638. The original is a winged altarpiece, with the outside of the hinged wings also painted. These can be folded over the central panel, giving an 'open view' and a 'closed view'.

The original is in the Cathedral of Our Lady in Antwerp, as the church for which it was painted has been destroyed. The smaller version is now in the Art Gallery of Ontario, Canada. Another smaller triptych with a different composition, and an oil study, are in the Louvre in Paris.