The necrology of the abbey of Newhouse states that Fergus was the founder of a Premonstratensian house at Whithorn. Both he and Christian are stated by the necrology of the abbey of Prémontré to have founded a monastery at Whithorn. Christian's tenure as bishop (1154–1186), and Fergus's reign as lord (×1160), suggest that the priory of Whithorn was founded at some point between about 1154 and 1160. According to the annals of Maurice of Prato, this house was transformed into a Premonstratensian house by Christian in about 1177. These sources, therefore, appear to reveal that Fergus was responsible for the establishment of a possibly Augustinian house at Whithorn, whilst Christian was responsible for its later refoundation as a Premonstratensian institution. Such a switch was not an unknown occurrence in England or on the Continent.