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Catholic Encyclopedia
http://www.newadvent.org/cathen/15026a.htm
Also known as St. Trasilla or Tharsilla. An aunt of Pope St. Gregory I, dedicated to virginity, d. 24 December.
Catholic Online
http://saints.catholic.org/saints/tarsilla.html
Very brief summary.
For All the Saints
http://www.saintpatrickdc.org/ss/1224.htm#tars
Very brief biography of St. Tarsilla.