Collaboration from Robert H. van Gent Several Ptolemy portraits can found in this book: BENNETT, J.A., & D.B. Meli, Sphaera Mundi - Astronomy Books 1478-1600, Whipple Museum of the History of Science, Cambridge, 1994. Page 25 has a woodcut of Ptolemy holding an astrolabe and an unidentified person reading a book under a schematized celestial sphere from the 1514 Vienna edition of the Tabulae eclypsium of Georgius Puerbachius and the Tabula primi mobilis of Johannes Regiomontanus.