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 (dī′ə-klē′shən) Originally Gaius Aurelius Valerius Diocletianus. ad 245?-313?
Emperor of Rome (284-305) who divided the empire into east and west (286) in an attempt to rule the territory more effectively. His desire to revive the old religion of Rome led to the last major persecution of the Christians (303).
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Biography) full name Gaius Aurelius Valerius Diocletianus. 245–313 ad, Roman emperor (284–305), who divided the empire into four administrative units (293) and instigated the last severe persecution of the Christians (303)
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌdaɪ əˈkli ʃən)

(Gaius Aurelius Valerius Diocletianus), A.D. 245–316, emperor of Rome 284–305.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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Noun1.Diocletian - Roman Emperor who when faced with military problems decided in 286 to divide the Roman Empire between himself in the east and Maximian in the west; he initiated the last persecution of the Christians in 303 (245-313)
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References in classic literature ?
We see also that kings that have been fortunate conquerors, in their first years, it being not possible for them to go forward infinitely, but that they must have some check, or arrest in their fortunes, turn in their latter years to be superstitious, and melancholy; as did Alexander the Great; Diocletian; and in our memory, Charles the Fifth; and others: for he that is used to go forward, and findeth a stop, falleth out of his own favor, and is not the thing he was.
David Toft Ace Tipster Diocletian 4.45 Ffos Las Shaped well from off the pace in testing ground at Chester last time and conditions here will not be a problem.
Celestial Force, successful at Beverley in June and placed at Ascot two weeks ago, together with Diocletian, who showed improved form at Sandown Park last time out, are short listed for the Goose Island Handicap Stakes.
Immerse yourself in the history of Emperor Diocletian's monumental palace in Split, brought to life by the intimate knowledge of a local guide
The present building, which dates back to 1804, is thought to be on the burial site of three Christian Kings who were killed in battle under orders from the Roman Emperor Diocletian in about 300AD.
The remains of Diocletian's Palace - which starred as the city of Meereen on Game of Thrones - is the buzzing heart of the city.
No Roman loved this area more than Emperor Diocletian who snatched a large parcel of the coast for his very own in what is now Split to build a large retirement palace to live out his days on this coastline, far from Rome, relaxing by the sea in what he felt to be one of the most beautiful locations on earth.
303 - Roman Emperor Diocletian begins his policy of persecuting Christians, razing the church at Nicomedia.
Since 1957, the Antiquities and Museums General Directorate has made excavations and rebuilt the destroyed parts of the northern walls starting from the northern corner of the National Museum till reaching the top of the hill behind the Camp of Diocletian, a Roman military complex built in the ancient city of Palmyra.
On February 313 AD, after Emperor Diocletian stopped persecuting Christians, Emperor Constantine issued the Edict of Milan, which decreed religious toleration.
A tour visits Diocletian's Palace, the 4th century Split fortress that doubled as former slave city of Meereen, and the setting for numerous scenes with Mother of Dragons Daenerys Targaryen.
St Januarius was believed to have been martyred around the year 305 during the Diocletian persecution.