Pagination with Arabic numerals on both sides of a page was probably first used in a 1513 edition of Niccolò Perotti’s Cornucopiae. This commentary on Martial’s epigrams offered a wide- ranging commentary on every word that Martial used and was valued as the most sophis-ticated Latin dictionary of its time. But since the words were discussed in the order in which they appeared in Martial’s poems, a powerful alphabetical index was essential. The printer Aldus Manutius of Venice explained the novelty of using page numbers in his index: “a very copious index in which each word that is sought can most easily be found, since each half page throughout the whole work is numbered . . . with arithmetical numbers.”

Arabic numerals, which became common in the thirteenth century)