High Quality Content by WIKIPEDIA articles! Severus Alexander (Latin: Marcus Aurelius Severus Alexander Augustus; 1 October 208 – 18 March 235) was Roman Emperor from 222 to 235. Alexander was the last emperor of the Severan dynasty. He succeeded his cousin Elagabalus upon the latter`s assassination in 222, and was ultimately assassinated himself, marking the epoch event for the Crisis of the Third Century — nearly fifty years of civil wars, foreign invasion, and collapse of the monetary economy.