The artist may be the Paolo d'Antonio da Ragusa known to have assisted Donatello (c. 1386-1466) in 1447 in making the altarpiece of the Santo in Padua. He produced three medals, of Alfonso V King of Aragon, both signed (NGA 1957.14.615.a,b) and unsigned (George Francis Hill, A Corpus of the Italian Medals of the Renaissance before Cellini, 2 vols., London, 1930: no. 46); and of Federigo da Montefeltro, count of Urbino, signed (Hill 1930, no. 47). Hill and Pollard (George Francis Hill, Medals of the Renaissance, Oxford, 1920; rev. and enlarged by Graham Pollard, London, 1978: 55) suggested that the medals were produced in or shortly before 1450.
[This is the biography of the artist published in the NGA systematic catalogue of Renaissance medals.]
Hill, George Francis. A Corpus of Italian Medals of the Renaissance before Cellini. 2 vols. London, 1930: 13.
Hill, George Francis. Medals of the Renaissance. Revised and englarged by Graham Pollard. London, 1978: 55.
Mauri, Mori, Giuseppe. "Una medaglia per Alfonso d'Aragona." Antologia di belle arti 21-22 (1984): 7-9.