In 305 y. A. D., after celebrating the triumph in Rome, where the capture family of persian king Narses was led through, Diocletian in perfect accordance with his own statute about 20-years term of administrating of Augustus, resigned and forced Maximian to do the same.
He moved off in Salon-city in his native Dalmatia, where he lived up to his decease in 313 y. He didn't interfere with political business anymore. Galerius and Constantius Chlorus became new Augustus. The Diocletian's position passed to Galerius.
The importance of the Diocletian's slate reforms consists, first of all in establishment of the new political system, that was included in the history of Rome under the name of Dominate. The Roman state becomes an unlimited absolute monarchy.
It was the epoch of last revival of former glory of the Roman Army, the occurrence of the new management system and the creation of the new machinery of the State, At the same time Diocletian was last, who tried to keep in inviolability the ancient religion of Rome, fighting with Christianity very cruely. He is the last great oppressor of the Christians.
The reign of Diocletian is some kind of critical time, when the new political system was established, but not all elements of the old one was rejected.
The long reformatory activity of Diocletian testifies, that he was a person of outstanding energy, state wit and military talent.