Agnes , M. a virgin, 12 or 13 years old, beheaded at Rome under Diocletian, celebrated by Ambrose (de Offic. i. 41; de Virg. ad Marcell. i. 2), Jerome ( Ep. 97 ad demetriad. ), Augustine (Serm. 273, 286, and 354), Sulp. Sever. ( Dial. ii. 14), Prudentius ( περὶ Στεφάνων , xiv.), Venant. Fortunatus (Poem. vii. iii. 35), Aldhelm ( de Virgin. ); and by her Acta in Syriac in Assemani, Act. Mart. ii. 148 seq.; besides Acta falsely attributed to St. Ambrose, a doubtful homily of St. Maxim. Taurin., and some verses questionably assigned to pope Damasus. Her name is in the Carthag. Cal. of c. 450, Jan. 21; in Ruinart, p. 695. A church at Rome, in her honour, said to have been built under Constantine the Great, was repaired by Pope Honorius, A.D. 625â€“638, and another was built at Rome by Innocent X. (Assemani, Act. Mart. ii. 154, 155). See also Act. SS. Jan. 21, on which day her name stands in the black-letter calendar of our Prayer-book. Baeda and Usuard place it on Jan. 23; the Menolog. and Menaea on July 5.