 The date of Sancho and Emenon's capture is not given, but Sancho disappears suddenly from Gascony in 855, when his nephew, Arnold, a son of Emenon, appears as duke.Musa is known to have made an expedition against the Marca Hispanica in 855–6, as recorded in Ibn al-Athir, Ibn Idari, and Ibn Khaldun.It is possible, on the other hand, that Sancho and Emenon were captured at the encounter of 851, where Gascons are known to have been present, or in 852, during a Frankish campaign to rescue Barcelona (recently captured) recorded in the "Annales regni Francorum".