It is quite ascertained, that a correspondence had been carried on between Cicero and Brutus; and a collection of the letters which had passed between them, extending to not less than eight books, existed for several ages after Cicero’s death. They were all written during the period which elapsed from the assassination of Cæsar to the tragical end of the orator, which comprehended about a year and a half; and it appears from the fragments of them, cited by Plutarch and the grammarians, that they chiefly related to the memorable political events of that important interval, and to a literary controversy which subsisted between Cicero and Brutus, with regard to the attributes of perfect eloquence(488). This collection is mentioned, and passages cited from it, by Quintilian, Plutarch, and even Nonius Marcellus(489), who lived about the year 400. After this, all trace of it is lost, till, in the fourteenth century, we find some of the disputed letters in the possession of Petrarch; and it has been conjectured that Petrarch himself was the discoverer of them(490). Eighteen of these letters, which were all that were then known, were published at Rome in 1470. Many years afterwards, five more, but in a mutilated state, were found in Germany, and these, in all subsequent editions, were printed along with the original eighteen. All the letters relate to the situation of public affairs after the death of Cæsar. They contain a good deal of recrimination: Brutus blaming Cicero for his dangerous elevation of Octavius, and conferring honours on him too profusely; Cicero censuring Brutus for having spared the life of Antony at the time of the conspiracy. Now the point in dispute is, If these twenty-three letters be parts of the original eight books of the genuine correspondence of Cicero and Brutus, so often cited by Plutarch, Quintilian, and Nonius; or if they be the forgery of some monk or sophist, during the dark ages which elapsed between the time of Nonius and Petrarch. From their very first appearance, the eighteen letters, which had come into the possession of Petrarch, passed among the learned for original epistles of Cicero and Brutus; and the five discovered in Germany, though doubted for a while, were soon received into the same rank with the others. Erasmus seems to have been the first who suspected the whole to be the declamatory composition of some rhetorician or sophist. They continued, however, to be cited by every other commentator, critic, and historian, as the unquestionable remains of the great author to whom they were ascribed. Middleton, in particular, in his Life of Cicero, freely referred to them as biographical authorities, along with the Familiar Epistles, and those to Atticus.