As noted in her wikipedia article, the subject graduated in 1922. This is an image of her receiving her degree from said graduation. This would place the time of the image to 1922.
Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country. Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Brigid_Lyons_Thornton.jpg
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THIS IMAGE IS SUBJECT TO COPYRIGHT IN THE REPUBLIC OF IRELAND UNDER THE COPYRIGHT AND RELATED RIGHTS ACT, 2000. It is privately owned and should not be used without applying to the owner for permission. The owner can be contacted via Longford County Library and Archives Services, Town Centre, Longford, Ireland; email archivist@longfordcoco.ie.
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{{subst:Upload marker added by en.wp UW}} {{Information |Description = {{en|Photograph of Brigid Lyons Thornton, Irish Doctor and Revoluntionary. }} |Source = '''Original publication''': Galway, Ireland<br/> '''Immediate source''': https://twitter.com/Womenof1916/status/716179857001025537 |Date = Circa. 1922 |Author = Unknown<br/> (Life time: Unknown) |Permission = As noted in her wikipedia article, the subject graduated in 1922. This is an image of her receiving her degree from said graduati...