Saint Helena (hĕl´ənə), c.248–328?, mother of Constantine I. She became a Christian in 313. According to tradition she found (327) the relic of the True Cross in Jerusalem and identified the location of the Holy Sepulcher. Feast: Aug. 18.
"Helena, Saint." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (February 21, 2018). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/helena-saint
"Helena, Saint." The Columbia Encyclopedia, 6th ed.. . Retrieved February 21, 2018 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/helena-saint