Sustermans was a famous painter and portrait painter in the service of the Medici court in Tuscany. Whilst he pursued his activities in Florence, he managed to remain faithful to the traditional Flemish styles. To him is attributed a famous portrait of Galileo. Justus Sustermans executed two portraits of Galileo when the latter was already advanced in years. One of these is conserved in the Galleria degli Uffizi, the other in the Pitti Palace.
Since 1761, accounts of the trial have concluded with the statement that Galileo, as he arose from his knees, exclaimed sotto voce, "E pur si muove" [nevertheless it does move]. That statement was long considered legendary, but it was discovered written on a portrait of Galileo completed c.1640. Source: http://www.bartleby.com/65/ga/Galileo.html.
O'CONNOR John J. and Edmund F. ROBERTSON, "Galileo Portraits", The MacTutor History of Mathematics Archive, University of Saint Andrews, Scotland, School of Mathematics and Statistics.
VAN HELDEN Albert, and Elizabeth BURR, "Pictures of Galileo", Galileo Project, Houston (TX), Rice University.