The radiate or Post-reform radiate (the Latin name, like many Roman coins of this time, is unknown), was a Roman coin introduced by Diocletian during his reforms. The radiate looked very similar to the Antoninianus, with a radiate crown like Sol Invictus, apart from the absence of the "XXI" marking that numismatists believe indicated that the coin contained 20 parts bronze to 1 part silver. The radiate had little or no silver content. The weight varies between 2.23 and 3.44 grams. There are also known radiates of Maximian, Constantius I, and Galerius, Diocletian's co-rulers, in the same style.