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Textual criticism has been practiced for over two thousand years, as one of the philological arts. Early textual critics, especially the librarians of Hellenistic Alexandria in the last two centuries BC, were concerned with preserving the works of antiquity, and this continued through the Middle Ages into the early modern period and the invention of the printing press. Textual criticism was an important aspect of the work of many Renaissance humanists, such as Desiderius Erasmus, who edited the Greek New Testament, creating the "Textus Receptus". In Italy, scholars such as Petrarch and Poggio Bracciolini collected and edited many Latin manuscripts, while a new spirit of critical enquiry was boosted by the attention to textual states, for example in the work of Lorenzo Valla on the purported Donation of Constantine.