The history of the Roman Senate goes as far back as the history of Rome itself. It was first created as a 100-member advisory group for the Roman kings. Later kings expanded the group to 300 members. When the kings were expelled from Rome and the Republic was formed, the Senate became the most powerful governing body. Instead of advising the head of state, it elected the chief executives, called consuls.
Senators were, for centuries, strictly from the patrician class. They practiced the skills of rhetoric and oratory to persuade other members of the ruling body. The Senate convened and passed laws in the curia, a large building on the grounds of the Roman Forum. Much later, Julius Caesar built a larger curia for an expanded Senate.
By the 3rd century B.C., Rome had conquered vast territories, and the powerful senators sent armies, negotiated terms of treaties, and had total control over the financial matters of the Republic.

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