The cult of Saint Petka as the healer was so strong, that members of all confessions (Orthodox, Catholics, Muslims), pilgrimaged the spring named after her in the fortress, which was believed to heal the blindness.
The veneration of Saint Petka as a healer was so widespread among different religious groups (Orthodox, Catholics, Muslims), that they all journeyed to the spring named after her in the fortress, which they thought could cure blindness.