<human>:  How many senators were there in the Roman senate?
<bot>: There were a total of 105 senators, but only a fraction of them were ever present at any one time. The number of senators who were present at any one time depended on the circumstances. For example, if the senate was meeting to discuss a particular issue, then all of the senators would be present. However, if the senate was not meeting to discuss a particular issue, then only a fraction of the senators would be present.