According to the Little Book of Catholic Saints (quoted at Ireland's Eye), St. Dympna (or Dymphna)was a virgin-martyr with a difference -- she escaped from her persecutor (an incestuous father) only to be tracked down in a very modern way -- by her financial transactions:
This
seventh century saint was supposedly the daughter of a pagan Celtic
chieftain, probably Irish, and a Christian mother. After his wife's
death the grieving chieftain conceived a passion for his daughter
because she resembled her mother, and he sought to marry her.
Horrified, Dympna fled with her chaplain, Saint Gerebernus. They
settled at Gheel, near the Belgian city of Antwerp, where Dympna
devoted herself to helping the poor and the sick. They were discovered
by her father, who had traced them through coins spent on their
journey. When Dympna continued to reject the unnatural marriage, her
father slew Gerebernus and severed her head.
Dympna is the patron saint of the mentally ill, incest victims, epileptics, and runaways.