Diocletian
Diocletian, nicknamed Jovius, was Roman emperor from 284 until his abdication in 305. He was born Diocles to a family of low status in the Roman province of Dalmatia. Diocles rose through the ranks of the military early in his career, eventually becoming a cavalry commander for the army of Emperor Carus. After the deaths of Carus and his son Numerian on a campaign in Persia, Diocles was proclaimed emperor by the troops, taking the name Diocletianus. The title was also claimed by Carus's surviving son, Carinus, but Diocletian defeated him in the Battle of the Margus.
22 December 0244
Born on the same birth day (22 December): Deems Taylor • Haldan Keffer Hartline • Jan Stephenson • Jean-Michel Basquiat • Joshua Bassett • Lewis Glucksman • Luis Hernández (footballer, born 1968) • Maurice Gibb • Pierre Brasseur • Rick Nielsen • Viola Kibiwot