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We arrive at truth, not by reason only, but also by the heart.
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.