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The Oxford Biography Index is an accurate index of notable people from throughout history – their names, dates, and fields of activity. References to full text articles are also provided, and many are available to public library members simply by inputting their library card number.

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Oxford Biography Index entry

Helena

Helena [St Helena, Helen, Flavia Julia Helena] (c.248–328/9), mother of the Roman emperor Constantine I

Oxford Biography Index Number 101054436 [what is this?]
http://www.oxforddnb.com/index/101054436/Helena     Primary authority: Oxford DNB

Full text available

Oxford Dictionary of National Biography

http://dx.doi.org/10.1093/ref:odnb/54436

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Oxford Reference Online: The Oxford Encyclopedia of Women in World History

http://www.oxfordreference.com/views/ENTRY.html?entry=t248.e434

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