The ikon and the feast are especially associated with a monastery just west of Constantinople at Balikli, built on the location of a miraculously-revealed holy spring. The fish in the pool are supposedly descended from some which jumped from a frying-pan. Many other monasteries, especially in Greece, bear the same name.
Theologically, however, it should be noted that pege means "wellspring" or "source", and that the ikon refers to this deeper meaning as well as to the place near Constantinople.
Norman Hugh Redington
Under construction --- far from complete! Read with caution.