The old territory of the Andes certainly spread on both sides of the river. So also, it seems, did the march of Count Lambert. The commission of a lord marcher is of necessity indefinite; it implies holding the border-land and extending it into the enemy’s country if possible. It appears to me that when Lambert turned traitor he carried out this principle from the other side; when Nantes became Breton, the whole land up to the Mayenne became Breton too. This view is distinctly supported by a charter in which Herispoë, in August 852, styles himself ruler of Britanny and up to the river Mayenne (Lobineau, _Hist. Bretagne_, vol. ii. col. 55); and it gives the most rational explanation of the Breton wars of Fulk the Good, Geoffrey Greygown and Fulk Nerra, which ended in Anjou’s recovery of the debateable ground. If it is correct, there is an end at once of the “bipartite county” and of Count Ingelger; “the other count” cannot have ruled west of the Mayenne, therefore he must have ruled east of it, and there is no room for any one else. The one writer whose testimony seems to lend some countenance to that of the _Gesta_ need not trouble us much. Fulk Rechin (Marchegay, _Comtes_, p. 374) does call Ingelger the first count; but his own confession that he knew nothing about his first five ancestors beyond their names gives us a right to think, in the absence of confirmatory evidence, that he may have been mistaken in using the title. He says nothing about the county having ever been bipartite, and his statement that his forefathers received their honours from Charles the Bald, not from the house of Paris (_ib._ p. 376), may be due to the same misconception, strengthened by a desire, which in Fulk Rechin would be extremely natural, to disclaim all connexion with the “genus impii Philippi,” or even by an indistinct idea of the investiture of Fulk I. For, if this is regarded as having taken place between 905 and 909, it must fall in the reign of Charles the Simple, and might be technically ascribed to him, though there can be no doubt that it was really owing to the duke of the French. Every step of Fulk’s life, as we can trace it in the charters, shows him following closely in the wake of Odo, Robert and Hugh; and the dependance of Anjou on the duchy of France is distinctly acknowledged by his grandson.