From his life, written with great piety, gravity, and erudition, by St.
Ardo Smaragdus, his disciple, to whom he committed the government of his
monastery of Anian, when he was called by the emperor near the court.
Ardo died March the 7th, in 843, and is honored at Anian among the
saints. He is not to be confounded with Smaragdus, abbot in the diocese
of Verdun, author of a commentary on the rules of St. Bennet. This
excellent life is published by Dom Menard, at the head of St. Bennet's
Concordia Regularum; by Henschenius, 12 Feb., and by Dom Mabillon, Acta
SS. Ben., vol. 5, pp. 191, 817. See Helyot, Hist. des Ord. Relig. t. 5,
p. 139. See also Bulteau, Hist. de l'Ord. de S. Benoit, l. 5, c. 2, p.
342. Eckart. de Reb. Fran. t. 2, pp. 117, 163.