On the other hand, while humanist Latin was an elegant literary language, it became much harder to write books about law, medicine, science or contemporary politics in Latin while observing all of the Humanists' norms about vocabulary purging and classical usage. Scholar Jürgen Leonhardt noted how these high standards changed speakers' relationship with the language: "Whereas during the Middle Ages, Latin had an instrumental function in human communications and in peoples' understanding of the world, for the humanists, the act of mastering the language became a measure of human self-perfection. In the end, the most important difference between medieval and humanist Latin may well have been the time and effort to learn it." Renaissance Latin gradually developed into the New Latin of the 16th–19th centuries, used as the language of choice for authors discussing subjects considered sufficiently important to merit an international (i.e., pan-European) audience. Renaissance Latin works and authors 14th century 1359. Epistolæ familiares by Petrarch (1304–1374) 1360. Genealogia deorum gentilium by Giovanni Boccaccio (1313–1375) 15th century 1409. Flos Duellatorum by Fiore dei Liberi 1425. Hermaphroditus by Antonio Beccadelli (1394–1471) 1441. De elegantiis Latinæ linguæ by Lorenzo Valla (1406–1457) 1442. Historia Florentini populi by Leonardo Bruni (c. 1370–1444) 1444. Historia de duobus amantibus by Æneas Sylvius Piccolomini, Pope Pius II (1405–1464) 1452. De re ædificatoria by Leone Battista Alberti (1404–1472) 1471. Contra amores by Bartolomeo Platina (1421–1481) 1479. De inventione dialectica by Rodolphus Agricola (1444–1485) 1481. Introductiones Latinæ by Antonio de Nebrija (1441–1522) 1486. De hominis dignitate by Giovanni Pico della Mirandola (1463–1494) 1491. Nutricia by Poliziano (1454–1494) Theologia Platonica de immortalitate animæ by Marsilio Ficino (1433–1499) Francesco Filelfo (1398–1481) References Further reading Cranz, F. Edward, Virginia Brown, and Paul Oslar Kristeller, eds. 1960–2003. Catalogus translationum et commentariorum: Medieval and Renaissance Latin Translations and Commentaries; Annotated Lists and Guides. 8 vols. Washington, DC: Catholic University of America Press. D’Amico, John F. 1984. “The Progress of Renaissance Latin Prose: The Case of Apuleianism.” Renaissance Quarterly 37: 351–92. Deitz, Luc. 2005. "The Tools of the Trade: A Few Remarks on Editing Renaissance Latin Texts." Humanistica Lovaniensia 54: 345-58. Hardie, Philip. 2013. “Shepherds’ Songs: Generic Variation in Renaissance Latin Epic.” In Generic Interfaces in Latin Literature: Encounters, Interactions and Transformations. Edited by Theodore D. Paphanghelis, Stephen J. Harrison, and Stavros Frangoulidis, 193–204. Berlin: De Gruyter. Houghton, L. B. T. 2013. “Renaissance Latin Love Elegy.” In The Cambridge Companion to Latin Love Elegy.