usurper
From LSJ
Τα βιβλία τα παρά των ξένων επαίδευε τους εν τη αγορά ανθρώπους, τους Ομήρου φίλους → The others' books educated the people in the marketplace, the friends of Homer.
tyrant: P. and V. τύραννος, ὁ.
one who claims more than his due: P. πλεονέκτης, ὁ.