the intention of king Servius Tullius; or the people might rise in
rebellion against a tyrannical ruler, and expel him.

Expulsion of the Tarquins from Rome

It was in this latter way that the monarchy was terminated in Rome.
For however much the history of the expulsion of the last Tarquinius,
"the proud," may have been interwoven with anecdotes and spun out into
a romance, it is not in its leading outlines to be called in question.
Tradition credibly enough indicates as the causes of the revolt, that
the king neglected to consult the senate and to complete its numbers;
that he pronounced sentences of capital punishment and confiscation
without advising with his counsellors; that he accumulated immense
stores of grain in his granaries, and exacted from the burgesses
military labour and task-work beyond what was due. The exasperation
of the people is attested by the formal vow which they made man by
man for themselves and for their posterity that thenceforth they would
never tolerate a king; by the blind hatred with which the name of king
was ever afterwards regarded in Rome; and above all by the enactment
that the "king for offering sacrifice" (-rex sacrorum- or
-sacrificulus-) --whom they considered it their duty to create that the
gods might not miss their accustomed mediator--should be disqualified
from holding any further office, so that this man became the foremost
indeed, but also the most powerless in the Roman commonwealth. Along
with the last king all the members of his clan were banished--a proof
how close at that time gentile ties still were. The Tarquinii
thereupon transferred themselves to Caere, perhaps their ancient
home,(1) where their family tomb has recently been discovered.
In the room of the one president holding office for life two
annual rulers were now placed at the head of the Roman community.