Diuo Caesari Augusto Ferdinando II. Bohemiae et Vngariae Regi etc. : sculptilia haec quae non minus alterius simulacrum quam opificis cultum exprimunt dicat Aegidius Sadeler Sacrae eiusdem Caesareae Maiesatis sculptor et cultor (1640)
Emperors -- Rome -- Family -- Portraits -- Early works to 1800 · Empresses -- Rome -- Portraits -- Early works to 1800 · Rome -- History -- Julio-Claudians, 30 B.C.-68 A.D · Rome -- History -- Flavians, 69-96
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.