Pietro Perna

His books promoted the Italian heretical thinkers at the origins of Socinianism and the theory of Tolerance.

He was a major publisher of Protestant historians like Flacius Illyricus and David Chytraeus and promoted the ars historica treatises of the period, notably the 18 authores de historia in Artis Historicae Penus (1579).

As a bookseller and apprentice printer he established a network of Italian connections that helped him act as a go between and publisher of Italian reformed thinkers and writers, such as Vermigli, Pier Paolo Vergerio, Jacopo Aconcio, Bernardino Ochino, Lelio Sozzini, Sebastian Castellio, Celio Secondo Curione, etc.

He published the first edition (editio princeps) of the original Greek text of the Enneads of Plotinus.

[3] Stimmer's distinctive woodcuts decorate numerous editions of Paolo Giovio, brought out by Perna and Heinrich Petri.