Crisis of the Third CenturyThe Crisis of the Third Century, also known as the Military Anarchy or the Imperial Crisis (235–284), was a period in which the Roman Empire nearly collapsed. The crisis ended due to the military victories of Aurelian and with the ascension of Diocletian and his implementation of reforms in 284. The crisis began in 235 with the assassination of Emperor Severus Alexander by his own troops. During the following 50-year period, the Empire saw the combined pressures of barbarian invasions and migrations into Roman territory, civil wars, peasant rebellions and political instability, with multiple usurpers competing for power.
GaleriusGalerius Valerius Maximianus (ɡəˈlɛəriəs; Greek: Γαλέριος; 258 – May 311) was Roman emperor from 305 to 311. During his reign he campaigned, aided by Diocletian, against the Sasanian Empire, sacking their capital Ctesiphon in 299. He also campaigned across the Danube against the Carpi, defeating them in 297 and 300. Although he was a staunch opponent of Christianity, Galerius ended the Diocletianic Persecution when he issued an Edict of Toleration in Serdica in 311.
IstanbulIstanbul (ˌɪstænˈbʊl , USalsoˈɪstænbʊl ; İstanbul isˈtanbuɫ), formerly known as Constantinople (Κωνσταντινούπολις; Constantinopolis; Ottoman Turkish: قسطنطينيه), is the largest city in Turkey, serving as the country's economic, cultural and historic hub. The city straddles the Bosporus strait, lying in both Europe and Asia, and has a population of over 15 million residents, comprising 19% of the population of Turkey. Istanbul is the most populous European city and the world's 15th-largest city.
GratianGratian (ˈɡreɪʃən, ; Gratianus; 18 April 359 – 25 August 383) was emperor of the Western Roman Empire from 367 to 383. The eldest son of Valentinian I, Gratian accompanied his father on several campaigns along the Rhine and Danube frontiers and was raised to the rank of Augustus in 367. Upon the death of Valentinian in 375, Gratian took over government of the west while his half-brother Valentinian II was also acclaimed emperor in Pannonia. Gratian governed the western provinces of the empire, while his uncle Valens was already the emperor over the east.
BasileusBasileus ( βασιλεύς ) is a Greek term and title that has signified various types of monarchs in history. In the English-speaking world it is perhaps most widely understood to mean "monarch", referring to either a "king" or an "emperor" and also by bishops of the Eastern Orthodox Church and Eastern Catholic Churches. The title was used by sovereigns and other persons of authority in ancient Greece, the Byzantine emperors, and the kings of modern Greece.
Constantine the GreatConstantine I (27 February 272 - 22 May 337), also known as Constantine the Great, was Roman emperor from AD 306 to 337. He was the first emperor to convert to Christianity. Born in Naissus, Dacia Mediterranea (now Niš, Serbia), he was the son of Flavius Constantius, a Roman army officer of Illyrian origin who had been one of the four rulers of the Tetrarchy. His mother, Helena, was a Greek woman of low birth and a Christian. Later canonized as a saint, she is traditionally attributed with the conversion of her son.
EmperorThe word emperor (from imperator, via empereor) can mean the male absolute ruler of an empire. Empress, the female equivalent, may indicate an emperor's wife (empress consort), mother/grandmother (empress dowager/grand empress dowager), or a woman who rules in her own right and name (empress regnant). Emperors are generally recognized to be of the highest monarchic honor and rank, surpassing kings.
Historia AugustaThe Historia Augusta (English: Augustan History) is a late Roman collection of biographies, written in Latin, of the Roman emperors, their junior colleagues, designated heirs and usurpers from 117 to 284. Supposedly modeled on the similar work of Suetonius, The Twelve Caesars, it presents itself as a compilation of works by six different authors (collectively known as the Scriptores Historiae Augustae), written during the reigns of Diocletian and Constantine I and addressed to those emperors or other important personages in Ancient Rome.
TsarTsar (zɑːr,_sɑːr or tsɑːr), also spelled czar, tzar, or csar, was a title used by Slavic monarchs. The term is derived from the Latin word caesar, which was intended to mean "emperor" in the European medieval sense of the term—a ruler with the same rank as a Roman emperor, holding it by the approval of another emperor or a supreme ecclesiastical official (the Pope or the Ecumenical Patriarch)—but was usually considered by Western Europeans to be equivalent to "king". It lends its name to a system of government, tsarist autocracy or tsarism.
