The penance of Theodosius is authenticated by Ambrose (tom. ii. de Obit. Theodos. c. 34, p. 1207), Augustine (The City of God, v. 26), and Paulinus (in Vit. Ambros. c. 24). Socrates is ignorant; Sozomen (1. vii. c. 25) concise; and the copious narrative of Theodoret (1. v. c. 18) must be used with precaution.