The characters in the Dominus saga, especially our dear Gaius, often refer to new buildings and other projects (roads, aqueducts, etc.) under construction in Rome during the reign of Trajan (AD 98-117).
Statue of a captured Dacian, 106-112 (Vatican Museum)
Here’s a LINK to a nice summary with photos and drawings of Trajan’s greatest and most influential building complex, the Forum and Markets of Trajan. Enjoy! 😀