How big is the Roman senate?

The Roman Senate originally had 300 members, but this number varied over time. During the late Republic, it expanded to around 600 members, and at certain points, it could reach over 1,000. Senators were typically drawn from the patrician and wealthy plebeian classes, and their influence was significant in Roman politics and governance. The Senate was a key advisory body, though its power fluctuated with the rise of imperial authority.