His original name was Diocles (Διοκλῆς), and changed it to Tyrannion to honor his teacher.
Later, he was given as a gift to Terentia, the wife of Cicero, who at some point freed him.
[3][4] He taught at Rome as an eminent grammarian[5] and established a school.
[6] He wrote many books which are now lost (although some may have confused with some of his teacher),[7] including the: Walter Haas believed that the younger Tyrannion was spoken only as Diocles and in the Die Fragmente des Grammatikers Dionysios Thrax, Die Fragmente der Grammatiker Tyrannion und Diokles, attributes the 'Tyrannion' fragments to the Elder, while the 'Diocles' fragments to the Younger.
[10] In addition, there is a possibility that there was also a different separate Diocles which is difficult to be distinguished from Tyrannion the Younger/Diocles.