Triptych: Artwork that contains three parts or panels

The word comes from the Greek adjective triptukhon (three-fold), from tri, (three) and ptysso, (to fold) or ptyx, (fold) The paintings are usually joined together, with hinges, so that they can be folded shut or displayed open. The middle painting is usually larger, although they can be of equal size.

A triptych is usually an art work, but the word can be used for anything in three parts which join together to make a single item.

The French and Burgundian Early Netherlandish painter Simon Marmion painted a diptych on the life of St Bertin which became a de facto Triptych       Left:reconstruction of the outside panels; center:reconstruction of the inside panels; right reconstruction of the Saint Bertin Altarpiece. The most important painted work attributed to Simon Marmion is the altarpiece commissioned in 1455-1459, for the main altar of the abbey of Saint Bertin in Saint-Omer, by his abbot Guillaume Fillâtre, bishop of Toul then of Tournai, advisor to Philip the Good. Only the two panels of the altarpiece remain today; they are scattered between the National Gallery in London (two panels representing Angels). and the Gemäldegalerie in Berlin (two long panels illustrating scenes from the life of Saint Bertin). The central part, in goldwork, has melted down in 1791 (French Revolution)

The English painter William Etty painted a 28 ft (8.5 m) wide and 9 ft 9 in (3 m) high triptych of the life of Saint Joan of Arc. Etty sold the painting; The new owners were an engraver and a dealer who went bankrupt in 1852. The paintings were separated and sold by 1893. The first panel which showed Joan of Arc finding the sword in the church of St. Catherine de Fierbois ended up in the collection of Llantarnam Abbey, Cwmbran, South Wales, U.K. (The Painting was sold at Auction by Bonham in 2021) The Second panel is in the collection of the Musée des Beaux-Arts d'Orléans. The third panel has since been lost.

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  Joan of Arc, On finding in the church of St Catherine de Frébus the sword she dreamt of, devotes herself & it to the service of God & her country.(From an 1851 engraving of the 1st panel).
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  'Joan of Arc makes a sortie from the gates of Orleans, and scatters the enemies of France.
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  Joan of Arc, after rendering the most signal services to her Prince and people, is suffered to die a martyr in their cause". C.W Wass {another version is 1849 engraving of the third panel from "The Penny Illustrated News" December 1, 1849 Vol 1, Issue 6 .p. 45".