ARNOLFO, bishop of SOISSONS. — A native of Brabant, he died at Altenburg on the eve of the Assumption in 1087. First a soldier, then a monk at S. Medardus of Soissons, in 1081 he became bishop of that city, where he encountered continual difficulties. Papal legate in Flanders from 1084, he founded there the Benedictine monastery of Altenburg (Oudenburg).
BIBL.: The life of A., written by another abbot of Altenburg, Ariolfo, with the addition of a third book of miracles, attributed to Bishop Lisiardo of Soissons, was read at the Council of Beauvais in 1120. — J. Mabillon, Acta SS. Ordinis s. B., IX, II, Paris 1701, pp. 502–57; Acta SS. Augusti, III, Antwerp 1737, pp. 221–259; Martyr. Romanum, p. 240; PL 174, 1371–80; BHL, I, Brussels 1898–99, no. 704. Giuseppe Löw