Map of the world in 250. Marcus Aurelius Valerius Maximianus Herculius (c 250 &ndash c The Roman Empire was the post-Republican phase of the ancient Roman civilization, characterised by an autocratic form of government and large territorial An emperor (from the Latin " Imperator " is a (male Monarch, usually the sovereign ruler of an Empire or another type of Galerius Maximianus ( ca. 260&ndashlate April or early May 311 formally Gaius Galerius Valerius Maximianus was Roman Emperor from 305 to 311 Flavius Valerius Constantius ( March 31 c 250&ndash July 25 306) was an emperor of the Western Roman Empire (305&ndash306 Flavius Valerius Aurelius Constantinus (27 February ca. 272 &ndash 22 May 337 commonly known as Constantine I, Constantine the Great, or Saint Constantine For other Romans of this name see Licinius (gens. Valerius Licinianus Licinius (c Arius ( AD ca 250 or 256 - 336 was a Christian priest from Alexandria Egypt in the early fourth century whose teachings now called Arianism A Christian is a person who adheres to Christianity, a monotheistic Religion centered on the life and teachings of Jesus of Nazareth A priest or priestess is a person having the authority or power to administer religious rites in particular rites of sacrifice to and propitiation of a deity or deities Arianism is the theological teaching of Arius (c AD 250-336 who was ruled a heretic by the Christian church at the Council of Nicea. Zuo Si (左思 (250 - 305 Courtesy name Taichong (太沖 was a writer of the Western Jin. Events 250 - Emperor Decius begins a widespread persecution of Christians in Rome. Pope Ambrose of Alexandria (d ca 250 was a friend of the Christian Theologian Origen. Great-martyr Mercurius (224 – 250 was a Christian saint and Martyr. Saint Denise refers to two Christian Martyrs of the early church Acharya Nāgārjuna ( Telugu: నాగార్జున (c 150 - 250 CE) was an Indian philosopher the founder of the Madhyamaka Mahayana ( Sanskrit: mahāyāna, Devanagari: महायान 'Great Vehicle' is one of the two main existing schools of Buddhism and a term for Buddhism is a family of beliefs and practices Zhu Ju (194-250 an officer of the Three Kingdoms Period who became the husband of the daughter of Sun Quan. Eastern Wu ( Chinese: 東吳 Pinyin: Dōng Wú also known as Sun Wu ( Traditional Chinese: 孫吳 pinyin Sūn Wú refers to a Wang Ling was an officer serving under the Kingdom of Wei during the Three Kingdoms Period of China. Cao Wei ( was one of the empires that competed for control of China during the Three Kingdoms period