Arnau de Vilanova at the summit of Oloron (1287): a major inflection point in the life of a medieval physician

In July 1287, during mediation by Edward I for the release of Charles, prince of Salerno, the kings of England and Aragon met with Charles' representatives at a large assembly at Oloron in Béarn, on the edge of the Pyrenees west of Bayonne. An English document deriving from this meeting reveals the presence there of the famous physician Arnau de Vilanova, a member of the Aragonese party, and recipient of a gift from the king of England. This article demonstrates how this document and other recent discoveries, properly contextualised, can illuminate an obscure period in Arnau's life in which he turned towards a new pattern of existence.