found: Scharf, George. Description of the Wilton House diptych, 1882:pages 7-10 (earliest known account is in a descriptive catalogue of the works of art that belonged to King Charles I from 1639; Sir James Palmer gave it to Charles I, and Charles II gave it to Sir James's son, Roger, from whose estate it was bought in 1705 by Thomas Herbert, Earl of Pembroke, who hung it at Wilton House)
found: The Wilton diptych, [approximately 1930?]
found: Ilg, Ulrike. Das Wiltondiptychon, [1996]
found: Gordon, Dillian. The Wilton diptych, [2015]
found: The National Gallery web site, viewed 16 March 2017(The Wilton Diptych; full title, Richard II presented to the Virgin and Child by his Patron Saint John the Baptist and Saints Edward and Edmund; artist, English or French (?); made about 1395-1399; medium, egg on oak; dimensions, 53 x 37 cm; inventory number, NG4451)
found: Wikipedia, viewed 16 March 2017:Wilton Diptych (small portable diptych; two panels of Baltic oak, set in frames of the same material and joined by two hinges, are painted in tempura, with gold leaf inlays and tooling under the gilding in places; made c. 1395-1399 by an unknown artist, of unknown but probably French nationality, sometimes referred to as the Wilton Master, who has not been associated with any other panel paintings; painted for King Richard II of England who is depicted; outstanding example of the International Gothic style; currently in the National Gallery, which bought it in 1929 from the Earl of Pembroke)