After his death, Boisil appeared twice in a vision to a monk he had known, concerning the future Bishop Ecgberht of Ripon, who was instructed to concentrate on existing monasteries rather than missionary activity on the Continent. He is believed, on somewhat dubious authority, to have written certain theological works, but they have not been preserved. St Boswells in Roxburghshire commemorates his name.
Following Boisil's death, a monk he had known appeared to him twice in a vision, informing about the future Bishop Ecgberht of Ripon who was advised to focus on existing monasteries rather than missionary work abroad. It is believed that he wrote some theological works, though these have not been preserved. St Boswells in Roxburghshire honors his name.