Note 236 — Chapter II · THE BEGINNINGS OF ANJOU. 843–987.
Reading edition
Ann. Bertin. a. 851 (Rer. Gall. Scriptt., vol. vii. p. 68) mention the cession of Nantes, etc. That the Mayenne was made the boundary of the two kingdoms appears from a charter of the Breton king Herispoë, dated August 23, 852; “Erispoë princeps Britanniæ provinciæ et usque ad Medanum fluvium.... Dominante Erispoë ... in totam Britanniam et usque ad Medanum fluvium.” Lobineau, Hist. de Bretagne, vol. ii. p. 55.