His successors, Plautus and Terence, continued this process. The traditional metre of Greek epic poetry, the dactylic hexameter, was introduced into Latin literature by Ennius (239–169 BC). Ennius provided a model for the later 'classical' poets such as Virgil and Ovid. Horace (who was a contemporary of Virgil) wrote verses in dactylic hexameter. They were in a conversational style, as if writing a letter. Virgil's hexameters are regarded as "the supreme metrical system of Latin literature".