Roman AE Coin of Diocletian (AD 284-305) NGC(F) – Collectible Treasure! In 284, Diocletian took charge, bringing an end to a chaotic era of rule. He was notorious for his harsh stance against Christians and is famously known for his Palace, an inspiration for 19th-century Adam-style homes. Size: 19.8-27.5 mm. Obverse: Features the Emperor’s portrait. Reverse: Displays various mythological and military scenes. Add these coins to your collection or gift them to someone starting their coin collection. Please take a look at my other listings. 50 Different World coins. 100 Different World coins. 150 Coins from 30 countries. 1500 Coins from 160 Countries. Small sets of coins. China, People’s Republic. Germany, Democratic Republic (DDR). United States of America. Medium sets of coins. Bulk sets of coins.