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Diocletian (Gaius Aurelius Valerius Diocletianus, about 245 to about 312) was Roman Emperor from 20 November 284 to 11 May 305. He was born in Dalmatia of poor parents. Diocletian ended the period known as the Crisis of the Third Century (235–284). He worked to return Rome to its former glory by making changes in key areas.

Religion: He persecuted Christians, crucifying more than any other emperor. He imposed the traditional polytheistic religion of the Romans.