Giacomo Mazzocchi, in Latin on his titlepages Jacobus Mazochius, (active 1505[1] — 1527) was a learned bookseller, printer, and noted antiquarian in papal Rome during the High Renaissance.
[2] A native of Bergamo, Mazzocchi is first heard of in 1505 as provider of finance for an edition of Vibius Sequester De fluminibus printed by J. Besicken of Rome.
Mazzocchi's other books include Latin translations of Greek texts, among them Byzantine authors little known at the time such as the historians Procopius and Agathias.
For even more limited circulation he published ephemera that have become bibliographical rarities, but that show him as a trusted printer for the inner circle of Roman humanists: a tract on Roman calendars (1509),[5] a letter on sculptures in the Cortile del Belvedere by the nephew of the famous Pico della Mirandola (1513),[6] or twelve panegyrics composed by Petrus Franciscus Justulus of Spoleto, honouring the Papal nephew Cesare Borgia (1510).
[10] Typographically Mazzocchi's work is of interest for his very early use of a large-format upper-case roman typeface for title-pages, headings and other prominent lines.