Justus Sustermans, Joost Sustermans or Suttermans, his given name Italianised to Giusto, was a Flemish painter and draughtsman who is mainly known for his portraits. He also painted history and genre paintings, still lifes and animals.
Justus Sustermans by Anthony van Dyck
Portrait of Galileo Galilei
Portrait of Domenica delle Cascine, la Cecca di Pratolino and Pietro Moro
Equestrian portrait of Ferdinando de' Medici
Cosimo II de' Medici was Grand Duke of Tuscany from 1609 until his death. He was the elder son of Ferdinando I de' Medici, Grand Duke of Tuscany, and Christina of Lorraine.
Cosimo II after Justus Sustermans
Cristofano Allori: Cosimo II
Portrait of Cosimo II de' Medici, 17th century, National Museum in Kraków
Dedication to Medici in volume I of "Opere di Galileo Galilei" (1718)