The chronology of the coinage of Hadrian is notoriously problematic. This paper presents the results of a die analysis of 1,800 aurei of Hadrian dating to the first twelve years of his reign. These coins proved to have been struck by 403 obverse and 369 reverse dies. The links between these dies make it possible to reconstruct the chronology of many of the coin types in this period, at times with great accuracy. The study also reveals important details about the volume of aureus production and the organization of the Roman mint in this period.