I must admit that I'm not well up on the religious side of this but if I have read and understood correctly, the daughter was also a saint. Namewise, it appears to be quite complicated and varies depending on which religion. I'll be very interested to read replies from those of you with more knowledge on this subject once the location has been correctly guessed.
I'm better at answering questions about the place ie. chapel and the location.
Location Clue: Near two lots of water.