Francesco Barozzi's Procli Diadochi

This is the frontispiece of Procli Diadochi by Francesco Barozzi, published in Venice, 1560.  Barozzi (1537 - 1604) was a Venetian nobleman, a mathematician, astronomer and humanist.  A correspondent of Christopher Clavius, he was well known in the Italian mathematical community of the time.  He was a translator of and commentator on ancient mathematical classics and was particularly active in the 16th century movement to revive an interest in Euclidean geometry.  His book is a translation of and commentary on Proclus Diadochus’ ( 411 - 485 ) edition of Euclid's Elements.  The portrait depicts Barozzi.

A discussion of parallel lines from Procli Diadochi, pages 214 - 215.  Barozzi was noted for devising fourteen different methods for constructing a set of parallel lines.