How many served in the Roman Senate? How many could serve in the Athenian Assembly? (see Doc E)

The Roman Senate was the main deliberative body of Ancient Rome. Its members represented the two most important political groups of the time, the Optimates (aristocrats) and the Populars (the people). It had various functions, the most important being to control the foreign policy and finances of the Roman nation. Initially, the Roman Senate was made up of 300 members, although later this number rose to 900 senators.

Instead, the Athenian Assembly, called Ekklesia, was the deliberative body of Athenian democracy, in which all free men of a certain purchasing power gathered to make the main decisions of the polis. Because there was no limit on the number of free men, these assemblies did not have a certain number of members, which used to far exceed thousands of people.

brave new world, aldous huxley (1932)