Studio of Agnolo Bronzino
Florence 1503 - 1572
PORTRAIT OF COSIMO I DE MEDICI, GRAND DUKE OF TUSCANY
Possibly one of the members of the Holy Military Order of St. Stephen Pope and Martyr, founded in 1561 by Cosimo I de' Medici in Florence (bears their wax seal on its reverse).
Possibly K. Langedijk, The portraits of the Medici: 15th-18th centuries, Florence 1981, pp. 421-2, under cat. no. 36, either nos. 3 or 5.