Vibius Sequester is the author of an alphabetical list of geographical names occurring in the Roman poets, with special reference to Virgil

Virgil

Publius Vergilius Maro, usually called Virgil or Vergil in English , was an ancient Roman poet of the Augustan period. He is known for three major works of Latin literature, the Eclogues , the Georgics, and the epic Aeneid...

, Ovid

Ovid

Publius Ovidius Naso , known as Ovid in the English-speaking world, was a Roman poet who is best known as the author of the three major collections of erotic poetry: Heroides, Amores, and Ars Amatoria...

 and Lucan. Several of the names do not appear in our copies of the poets; unless this is the result of carelessness or ignorance, the compiler must have had access to sources no longer extant.