Uncle Jaque
according to the incriptions the saints are named Petka and Nedelya.
they're both woman (sorry El Greko! not a bad guess)
I never heard of those names before so I guess they are both local Bulgarian/Macedonian saints. Maybe someone else here knows more about them. I believe Nedela is the old slavic word for Sunday, so its possible her name was translated, if so, Greeks would know her as St. Kyriaki or Dominica in Latin.

Mark K