Final answer:
The forum and markets of Trajan were built in the 2nd century CE. The Forum of Trajan was inaugurated in 112 CE, as was the Markets of Trajan. The complex of the markets covers a large space and preserves many rooms.
Step-by-step explanation:
The forum and markets of Trajan were built in the 2nd century CE. The Forum of Trajan was inaugurated in 112 CE, although construction may not have been complete. The Markets of Trajan, a separate complex adjacent to the forum, were also built around the same time. The complex covers a space of approximately 110 by 150 meters and preserves 170 rooms.