Gilles Personne de Roberval, French mathematician, was born at Roberval near Beauvais, France. His name was originally Gilles Personne or Gilles Personier, with Roberval the place of his birth.
Portrait of Gilles Personne de Roberval (1602-1675) at the inauguration of the French Academy of Sciences, 1666, where he was a founding member.
Evangelista Torricelli was an Italian physicist and mathematician, and a student of Galileo. He is best known for his invention of the barometer, but is also known for his advances in optics and work on the method of indivisibles. The torr is named after him.
Evangelista Torricelli by Lorenzo Lippi (c. 1647)
Torricelli's statue in the Museo di Storia Naturale di Firenze
Evangelista Torricelli portrayed on the frontpage of Lezioni d'Evangelista Torricelli
Torricelli's experiment