who was emperor diocletian?
Roman emperor
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 Diocletian ( / ˌdaɪ.əˈkliːʃən / ; Latin : Gaius Aurelius Valerius Diocletianus Augustus ) , born Diocles ( 244 – 311 ) , was a Roman emperor from 284 to 305 . Born to a family of low status in the Roman province of Dalmatia , Diocletian rose through the ranks of the military to become 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 ' other 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 . 

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 Domitian ( / dəˈmɪʃən , -iən / ; Latin : Titus Flavius Caesar Domitianus Augustus ; 24 October 51 – 18 September 96 ) was Roman emperor from 81 to 96 . Domitian was the third and last emperor of the Flavian dynasty . 

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 Once Emperor , Domitian immediately sought to attain his long delayed military glory . As early as 82 , or possibly 83 , he went to Gaul , ostensibly to conduct a census , and suddenly ordered an attack on the Chatti . For this purpose , a new legion was founded , Legio I Minervia , which constructed some 75 kilometres ( 46 mi ) of roads through Chattan territory to uncover the enemy 's hiding places . 

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 Nevertheless , if Diocletian ever did enter Rome shortly after his accession , he did not stay long ; he is attested back in the Balkans by 2 November 285 , on campaign against the Sarmatians . 

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 Diocletian divided the Empire again in 293 AD , appointing two Caesars ( junior emperors ) to rule over further subdivisions of East and West . Each would be subordinate to their respective Augustus ( senior emperor ) but would act with supreme authority in his assigned lands . This system would later be called the Tetrarchy . Diocletian 's first appointee for the office of Caesar was Constantius ; his second was Galerius , a native of Felix Romuliana . According to Lactantius , Galerius was a brutal , animalistic man . Although he shared the paganism of Rome 's aristocracy , he seemed to them an alien figure , a semi @-@ barbarian . On 1 March , Constantius was promoted to the office of Caesar , and dispatched to Gaul to fight the rebels Carausius and Allectus . In spite of meritocratic overtones , the Tetrarchy retained vestiges of hereditary privilege , and Constantine became the prime candidate for future appointment as Caesar as soon as his father took the position . Constantine went to the court of Diocletian , where he lived as his father 's heir presumptive . 
