Baccius, (Andrew), a celebrated physician of the 16th century, born at St Elpide. He practised physic at Rome with great reputation, and was first physician to pope Sixtus V. The most scarce and valuable of his works are, 1. De thermis. 2. De naturali minorum historia. 3. De venenis et antidotis. 4. De gemmis ac lapidibus pretiosis.

Baccio (Fra Bartolomeo), called Barteloni di S. Marco, a celebrated painter of history and portrait, was born at Savignano near Florence in 1469, and was a disciple of Cosimo Roselli; but his principal knowledge in the art of painting was derived from Leonardo da Vinci. He understood the true principles of design better than most masters of his time, and was also a considerable painter in perspective; which induced Raphael to have recourse to him after he had quitted the school of Perugino; and under his direction likewise Raphael studied the art of managing and uniting colours, as well as the rules of perspective. Some years after the departure of Raphael from Florence, Baccio visited Rome; and by the observations he made on the antiques, and the works of Raphael which were then the admiration of the whole world, he was extremely improved, and manifested his acquired abilities by a picture of S. Sebastiano, which he finished at his return to Florence. It was so well designed, so naturally and beautifully coloured, and had so strong an impression of pain and agony, that it was removed from the place where it was publicly seen (in the chapel of a convent), as it had been observed to have made too strong an impression on the imaginations of many women who beheld it. He was very laborious, and made nature his perpetual study; he designed the naked correctly; his figures had a great deal of grace, and his colouring was admirable. He is accounted to have been the first inventor of that machine called a laymon by the artists, and which to this day is in general use. Upon that he placed his draperies, to observe with greater exactness their natural and their more elegant folds. A capital picture of the ascension by Baccio is in the Florentine collection. He died in 1517.