Jean-Baptiste Guyard de La Fosse; Jean Colomb (1837). Histoire des évêques du Mans (in French). Ch. Richelet. pp. 293–299.
Martin Berruyer had been Dean of the Cathedral Chapter of Tours, Treasurer of St. Martin of Tours, and Canon of Le Mans. He was consecrated bishop of Le Mans on 2 April 1452 by Bishop Jean of Noyon at Noyon. His administration was a difficult one, since Le Mans had just been wrested from the hands of the English after a siege, on 16 March 1448. He died on 23 April 1466. Piolin, V, pp. 157-170. Cf. Eubel, II, p. 124. Berruyer left a memoir written in defense of Joan of Arc: Jean Baptiste Joseph Ayroles (1890). "Chapitre IX: Martin Berruyer et son mémoire". La vraie Jeanne d'Arc ... (in French). Gaume et cie. pp. 403–436.
The story is related only in anonymous tale written by a monk of Le Mans in 1692, which is filled with errors. Jean de Troezen died around the time that the Dominican convent was being built, he says, and wanted to be buried inside its walls. The story must be true, since in 1674, when the monks were erecting a new high altar they found the remains and armor of a soldier. Marie-Dominique Chapotin (1898). Histoire des dominicains de la province de France. Cagniard (Léon Gy, successeur). pp. 150–151.
Charles the Bald often stayed at Verberie. Since 732 in the reign of Charles Martel, there was a country residence for Frankish and Carolingian kings. Charlemagne had had a vast palace built there. Viking incursions in 885 sacked it, but it remained a royal residence until the time of Robert-le-Pieux (996-1031). It was then replaced by the nearby castle of the Capetian kings built at Béthisy-Saint-Pierre, which was less vulnerable to invasion. https://histoire-compiegne.com/autour-de-compiegne/verberie/