Despite being one of the most closely studied surviving panel paintings from medieval England, the Wilton Diptych carries no signature, and no documentary record naming its painter has ever surfaced, an absence that has occupied art historians for well over a century. What survives instead is the object itself, and scholars have built their case for who might have painted it almost entirely from close visual comparison with other surviving works of the period.
The central disagreement is nationality rather than a specific name: some historians argue the painter's technique and materials point to an English court artist working in a style closely related to other Ricardian-era English painting, while others argue the refined modeling, the specific gold-ground technique and certain stylistic details point instead to a painter trained in the French or Franco-Flemish courtly tradition, quite possibly someone who had worked directly for the French royal or ducal courts before entering Richard's service. Both readings remain actively defended in the current scholarship, and the National Gallery's own catalogue entry presents the artist's nationality as "English or French (?)," a formulation that states the uncertainty rather than resolving it.
The uncertainty is not for lack of trying. Technical analysis of the pigments, the gilding method and the panel construction has narrowed the range of plausible workshops considerably without closing the question entirely, leaving the Wilton Diptych as a rare case of a major, extensively studied medieval masterpiece whose maker remains, after more than a century of dedicated scholarly attention, still genuinely unknown.