1297, "absolute ruler," from O.Fr.
tyrant (12c.), from L.
tyrannus "lord, master, tyrant" (cf. Sp.
tirano, It.
tiranno), from Gk.
tyrannos "lord, master, sovereign, absolute ruler," a loan-word from a language of Asia Minor (probably Lydian); cf. Etruscan
Turan "mistress, lady" (surname of Venus).
"In the exact sense, a tyrant is an individual who arrogates to himself the royal authority without having a right to it. This is how the Greeks understood the word 'tyrant': they applied it indifferently to good and bad princes whose authority was not legitimate." [Rousseau, "The Social Contract"]
The spelling with
-t arose in O.Fr. by analogy with prp. endings in
-ant. Fem. form
tyranness is recorded from 1590 (Spenser); cf. M.L.
tyrannissa (1372).