The Chaucer Review: An Indexed Bibliography (Vols. 1-30)

Yoder, Emily K. "Chaucer and the 'Breton' Lay." 12 (1977): 74-77.
The term "Breton" lay as used by Chaucer and the writer of Sir Orpheo refers to rhymed narrative produced in Britain that is, the British island, not Brittany in what is now France, before the Germanic invasions or, after the invasions, in pockets held by the Celts and the Welsh.