I had to look up the oath of
Brutus, I didn’t know what it was. Apparently, Brutus' first act after the
expulsion of Lucius Tarquinius Superbus (The seventh and final king of Rome and
a notorious tyrant) was to bring the people to swear an oath never to allow any
man again to be king in Rome. There is no scholarly agreement that the oath actually
took place.
The Oath of Brutus before the statue, Fyodor Bronnikov
François-Joseph_Navez