A. M. Canto, 2000, p. 291, reads the inscription D(ominus) n(oster) Theodosius perpet(uus)ยท Aug(ustus) ob diem felicissimum XV (i.e., quindecennalium), the 15 years of his reign. She sees a V over the X, therefore XV (pages 291 ff, and 1-2 of the addenda of 2015), and also believes the date of 388 impossible because Valentinian II lived and, being the senior emperor, he could not be in a second plane with respect to Theodosius. However, in 393 Valentinian II had already passed away. Therefore the date historically more possible are the quindecennalia of Theodosius I, January 19, 393 AD. (pp. 297 ff.), being the two co-reigning Augusti the sons of Theodosius, Arcadius and Honorius.
