Churches whose erection in the Habsburg hereditary duchies of Silesia was approved by the Catholic Emperor Ferdinand III under pressure from the Protestant imperial estates and Sweden. Their building was subject to additional conditions that would make their erection more complicated or if completed, their use short-lived. The churches could only be built outside the city walls within a period of one year. Only wood, clay and straw were allowed as building materials. Likewise, no tower was allowed to be erected.
