Tyrannion (Ancient Greek: Τυραννίων, Tyranníōn; Latin: Tyrannio; fl.
1st century BC) was a Greek grammarian brought to Rome as a war captive and slave.
He was a pupil of Hestiaeus of Amisus, and was originally called Theophrastus, but received from his instructor the name of Tyrannion ("the tyrant") on account of his domineering behaviour to his fellow disciples.
[5] Cicero employed him in a similar manner, and speaks in the highest terms of the learning and ability which Tyrannion exhibited in these labours.
[9] Tyrannion amassed considerable wealth, and, according to the scarcely credible statement of the Suda,[10] collected himself a library of 30,000 volumes.