One source that may possibly cast light on Fergus's familial origins is "Roman de Fergus", a mediaeval Arthurian romance, mainly set in southern Scotland, which tells the tale of a knight who may represent Fergus himself. The name of the knight's father in this source is a form of the name borne by Fergus's neighbouring contemporary Somairle mac Gilla Brigte, Lord of Argyll, and could be evidence that Fergus's father bore the same name. On the other hand, instead of being evidence of any historical relationship, the names could have been employed by the romance merely because they were regarded as stereotypically Gallovidian. In any case, there is reason to suspect that the romance is a literary pastiche or parody of the compositions of Chrétien de Troyes; and besides the coincidence of names, the tale has little to commend it as an authoritative source for the historical Fergus.