Chronographus Anni CCCLIIII, [Item Imperia Caesarum],  148.21-24 (ca. late fifth century A.D.):

Diocletianus et Maximianus imper. ann. XXI m. XI dies XII. cong. dederunt [M] DL. His imper. multae operae publicae fabricatae sunt: senatum, forum Caesaris, basilica Iulia, scaena Pompei, porticos II, nymfea III, templa II Iseum and Serapeum, arcum novum, thermas Diocletianas.

Diocletian and Maximian ruled for 21 years 11 months and 12 days. They gave a donation of 1550 denarii. With these men ruling, many public buildings were constructed: the senate, the forum of Caesar, the Iulian basilica, the scaena of Pompeius, [the] two porticos, three nymphaei, two temples, Isis and Serapis, a new arch, and the baths of Diocletian. (U. K. Vestal, trans.)