Born in 1502, Martin Klostermair studied medicine at the University of Ingolstadt between 1528 and 1530, which had been founded by Louis the Rich, Duke of Bavaria, in 1472. He is recorded in Munich from 1547 until 1561 as one of three personal physicians during the reigns of William IV and Albert V, Dukes of Bavaria. Klostermair seems to have been in close contact with the humanists of his time and well-versed in Latin; in 1576 he published his Chronographia partialis and Arithmologia about the founding of Munich and other events of Bavarian history. The inscription underlines the faithful representation of the sitter’s physiognomy. It reads ‘Such are the eyes of the physician, such does the mouth appear, as here the artist shows, by his hand, the medicus aged 60’.