Original: Gaius Aurelius Valerius Diocletianus (c. 22 December 244 â "3 December 311), commonly known as Diocletian, was a Roman Emperor from 284 to 305.
Simplified: Diocletian (Gaius Aurelius Valerius Diocletianus, ~ 245 to ~ 312) was Roman Emperor from 20 November 284 to 11 May 305. Diocletian ended the period known as the Crisis of the Third Century (235 â "284).