The world in 300. The pages listed below contain information about trends and events in particular centuries and millennia. The 2nd century is the period from 101 to 200 in accordance with the Julian calendar in the Christian / Common Era. The 3rd century is the period from 201 to 300 in accordance with the Julian calendar in the Christian / Common Era. As a means of recording the passage of Time, the 4th century (per the Julian calendar and Anno Domini / Common era) was that Century See also List of centuries, History This is a list of Decades in history including links to corresponding articles with more information about them Events and Trends Crisis of the Third Century Significant people Aurelian, Roman Emperor Marcus Events and Trends Around 285 Saint Anthony retired to a hermits life in the Egyptian desert Events and Trends Significant people Diocletian, Roman Emperor Maximian, Roman Emperor Events and Trends Significant people Constantine, Roman Emperor Licinius, Roman Emperor Events and Trends Constantine I of the Roman Empire starts legislating Christian beliefs into civil law. Events and Trends Constantinople dedicated as the second capital of the Roman Empire in 330 Significant People This page indexes the individual Years pages Twenty-first century Events By Place Roman Empire Galerius conquers Ctesiphon from the Persians however as part of the peace treaty it Events By Place Roman Empire Constantius Chlorus defeats the Alamanni in the territory of the Lingones (Langres and strengthens Events By Place Roman Empire Galerius defeats the Sarmatians and the Carpians. For the article see Article 301 (Turkish penal code. Events By Place Roman Empire Emperor Diocletian issues his Events By Place Roman Empire Diocletian begins passing laws against Christians. Events By Place Roman Empire Persuaded by Galerius, Diocletian launches the last major persecution of Christians