Diptych
In it's most basic form, a diptych is any object with two flat plates usually attached at a hinge. In ancient times a diptych was also a type of icon whereby two panels are joined together with a hinge, so that they may fold together for protection when travelling, and then be unfolded for veneration when one's destination has been reached. Today a diptych can also loosely refer to a work made up of two matching or co-ordinating parts and is used by artists in panel paintings and photography for example.
Gerlach Flicke; Henry Strangwish (Strangways)
by Gerlach Flicke
1554
NPG 6353
Queen Mary II; King William III
by Wallerant Vaillant, after Unknown artist
1677
NPG D9227
Anne, Princess Royal and Princess of Orange; William Charles Henry Friso, Prince of Orange
after Philip Mercier, and after Philip van Dyk
1734 or after
NPG D17091
'French liberty British slavery'
by James Gillray, published by Hannah Humphrey
published 21 December 1792
NPG D12466
Queen Eleanor and King Henry III
after Unknown artist
perhaps 18th century
NPG D23653
Sir Roy Calne; John Bellany
by John Bellany
1992
NPG 6193
Colin Renfrew, Baron Renfrew of Kaimsthorn
by John Bellany
1992
NPG 6161
Stuart McPhail Hall
by Dawoud Bey
9 May 1998
NPG P730