 His etymologizing implies an interest in Roman antiquarianism, particularly the works of Varro on etymology and Roman religion.He similarly makes use of much Roman history writing, which must include lost historical poetry as well as the annal tradition (Ovid says in the prologue that one of his sources are ancient annals ("annalibus ... priscis" (1.7)).In his longer narrative sections, Ovid makes use of tragedy, epic poetry, elegy, and Hellenistic mythological poems.