248 AD – Born in Drepanon, Bithynia, Asia Minor. St. Helena, the wife of the emperor Constantius I Chlorus, and mother of Constantine the Great. She was a woman of humble origin, born probably at Drepanum, a town on the Gulf of Nicomedia, which Constantine named Helenopolis in her honor.
306 AD – Helena was married to the Roman emperor Constantius I Chlorus, who renounced her for political reasons. When her son Constantine I the Great became emperor at York, he made her empress dowager, and under his influence she later became a Christian.
328 AD – Died in Nicomedia.