<Tr> <Th_colspan="2"> Regnal name </Th> </Tr> <Tr> <Td_colspan="2"> Imperator Caesar Gaius Aurelius Valerius Diocletianus Augustus </Td> </Tr> <P> Diocletian (/ ˌdaɪ. əˈkliːʃən /; Latin: Gaius Aurelius Valerius Diocletianus Augustus), born Diocles (22 December 244--3 December 311), was a Roman emperor from 284 to 305 . Born to a family of low status in Dalmatia, Diocletian rose through the ranks of the military to become Roman cavalry commander to the Emperor Carus . After the deaths of Carus and his son Numerian on campaign in Persia, Diocletian was proclaimed emperor . The title was also claimed by Carus' surviving son, Carinus, but Diocletian defeated him in the Battle of the Margus . Diocletian's reign stabilized the empire and marks the end of the Crisis of the Third Century . He appointed fellow officer Maximian as Augustus, co-emperor, in 286 . Diocletian reigned in the Eastern Empire, and Maximian reigned in the Western Empire . Diocletian delegated further on 1 March 293, appointing Galerius and Constantius as Caesars, junior co-emperors, under himself and Maximian respectively . Under this' tetrarchy', or "rule of four", each emperor would rule over a quarter - division of the empire . Diocletian secured the empire's borders and purged it of all threats to his power . He defeated the Sarmatians and Carpi during several campaigns between 285 and 299, the Alamanni in 288, and usurpers in Egypt between 297 and 298 . Galerius, aided by Diocletian, campaigned successfully against Sassanid Persia, the empire's traditional enemy . In 299 he sacked their capital, Ctesiphon . Diocletian led the subsequent negotiations and achieved a lasting and favourable peace . </P> <P> Diocletian separated and enlarged the empire's civil and military services and reorganized the empire's provincial divisions, establishing the largest and most bureaucratic government in the history of the empire . He established new administrative centres in Nicomedia, Mediolanum, Sirmium, and Trier, closer to the empire's frontiers than the traditional capital at Rome . Building on third - century trends towards absolutism, he styled himself an autocrat, elevating himself above the empire's masses with imposing forms of court ceremonies and architecture . Bureaucratic and military growth, constant campaigning, and construction projects increased the state's expenditures and necessitated a comprehensive tax reform . From at least 297 on, imperial taxation was standardized, made more equitable, and levied at generally higher rates . </P>

The reign of the roman emperor diocletian was notable for
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