The Roman Senate was a political institution that worked for nearly 500 years. It was a government in charge of passing all the laws and collecting taxes.
Men from all wealthy families entered the Senate.
It was managed by two elected Consuls that would rule jointly for one year. These Consuls would be leading citizens of Rome.
Consuls did not often disagree with the Senate as they did not want to be voted out of office during their one year term, and they often became a member of the Senate following their time as Consul.
Although the Consuls only ruled for one year the Senate was a permanent body of government.
The size of the Senate would vary and it was known to have ranged from as little as three hundred men up to nine hundred. Once a person entered the Senate, they were a member for life.
In early roman times, the Senate was made up of men from wealthy noble families, patrician families and magistrates. As time went on members of plebian families (commoners) also became members of the Senate.