Today, a senate is the upper house of a bicameral legislature. When the American states redid their constitutions in 1775, they patterned their state government like the British Parliament: A lower house for the commoners, and an upper house for the upper class, like the House of Lords. Americans don’t have nobles, but we do have an upper class, and that’s what the states expected their upper houses to consist of: Aristocrats. Appointed—not elected—by the governor or lower house, meant to represent the interests of those who owned a lot of property and wealth in the state.
Exactly like the senate of the Roman Republic and Roman Empire, which is what those states usually named their upper houses.
Over the years, American senates became more democratic. No more appointments (except to fill a vacancy); popular elections. Less about giving aristocrats a say in the government (they got money; they’ll always have a say), and more a check and balance against the lower house. Anybody can now be elected senator, and needn’t be wealthy. The fact they often already are wealthy is a minor issue; when you have many possessions you’ll often be interested in government’s power over that. The fact they often quickly become wealthy indicates a profoundly corrupt system. But these are digressions, and not what this article is about today.
Thanks to democracy the meaning of “senate” gradually changed, which is why any article or talk about senates has to include this introduction.
Ancient Judea also had a senate. After the Achæmenid Empire (i.e. the Persian Empire) let Jews return to their homeland, they organized the elders into a governing council, loosely based on the 70 elders of Israel in Moses’s day.
Over time, and exposure to the Roman senate, this council gradually became a Judean senate, likewise consisting of all the wealthy, noble families of Judea. Americans regularly mix it up with our government bodies, and overlay democratic ideas upon it, and that’d be wrong. Or they’ll claim people got into this sanhédrin by merit: They’ll point to Gamaliel bar Gamaliel