In the image at right the axe, crown, sword, and cross are all attributes of this 6th-century saint. He was a Visigothic prince of Spain who ran afoul of his father the King when he converted from Arian to Catholic Christianity. His father had him imprisoned and then murdered. Some versions of his legend have him killed with an axe to the skull, as shown here. In others he is beheaded, also with an axe.
For an excellent introduction to this saint's iconography, see the Archdiocese of Madrid's Iconografía de San Hermengildo.
Prepared in 2014 by Richard Stracke, Emeritus Professor of English, Augusta University