The information in the following three paragraphs has been provided by Alonso Medina Arellano of Villanueva de la Reina. The material on which it is based is provided also on the website of Catholic.net, which cites the sources indicated below.
The idea that Saint Potenciana was a 12th-century martyr is found, for instance, in the short biography by Rodriguez Arévalo y Gabriel Castilla reproduced at Potenciana, Santa
mercaba.org
Santoral 17 de Abril (much more numerous are the sources that give 15 April as the feastday)
