In addition to the authors named above, Poggio discovered and copied with his own hand MSS. of Lucretius and Columella. Silius Italicus, Manillas, and Vitruvius owed their resurrection to his industry. At Langres he found a copy of Cicero's oration for Cæcina; at Monte Cassino a MS. of Frontinus. Ammianus Marcellinus, Nonius Marcellus, Probus, Flavius Caper, and Eutyches are also to be ranked among the captives freed by him from slavery. In exploring foreign convents where he suspected that ancient authors might lie buried, he spared neither trouble nor expense. 'No severity of winter cold, no snow, no length of journey, no roughness of roads, prevented him from bringing the monuments of literature to light,' wrote Francesco Barbaro.[98] Nor did he recoil from theft, if theft seemed necessary to secure a precious codex. In a letter to Ambrogio Traversari he relates his negotiations with a monk for the fraudulent abduction of an Ammianus and a Livy from a convent library in Hersfeld.[99] Not unfrequently his most golden anticipations with regard to literary treasures were deceived, as when a Dane appeared at the Court of Martin V. bragging of a complete Livy to be found in a Cistercian convent near Röskilde. This man protested he had seen the MS., and described the characters in which it was written with some minuteness. At Poggio's instance the Cardinal Orsini sent off a special messenger to seek for this, which would have been the very phoenix of MSS. to the Latinists of that period, while Cosimo de' Medici put his agents at Lübeck to work for the same purpose. All their efforts were in vain, however. The Livy could not be discovered, and the Dane passed for a liar, in spite of the corroboration his story received from another traveller.[100] Poggio himself, who would willingly have ransacked Europe for a MS., was jealous of money spent on any other object. In his treatise 'De Infelicitate Principum' he complains that 'these exalted personages [popes and princes] spend their days and their wealth in pleasure, in unworthy pursuits, in pestiferous and destructive wars. So great is their mental torpor that nothing can rouse them to search after the works of excellent writers, by whose wisdom and learning mankind are taught the way to true happiness.' This lamentation, written probably under the unfavourable impression produced upon his mind by the Papal Court, where as yet the spirit of humanism had hardly penetrated, must not be taken in any strict sense. Never was there a time in the world's history when money was spent more freely upon the collection and preservation of MSS., and when a more complete machinery was put in motion for the sake of securing literary treasures. Prince vied with prince, and eminent burgher with burgher, in buying books. The commercial correspondents of the Medici and other great Florentine houses, whose banks and discount offices extended over Europe and the