Priest Johannes Nepomuk Szadowski (1834–1914) was appointed pastor in Wielbark in 1872. During the initial period of his work in this city took measures to consolidate local Catholics and ensure their proper pastoral care. In obtaining a building for the purpose of oratory and apartment for pastor, as well as the construction site for the future church and numerous church utensils, participate clergy Warmia, as well as Catholic over diocesan associations and organizations. Requests for financial assistance in newspapers. Permission to build the temple received in 1878. Roofed it at the beginning of 1880., And her dedication took place on November 17, 1880. Fr. Szadowski also commissioned to care for Catholics living in Opaleniec and the surrounding area. In 1873 it succeeded in this village to build a small church timbered. Described priest sought the erection of a Catholic school in Wielbark, which opened in 1872. He also ran catechesis for children preparing to receive First Holy Communion. Particular concern surrounded the children from poor families. Before Christmas, in aid of charity, they received Christmas gifts. In Opaleniec in turn furnished a shelter for the elderly. Fr. In organized before. Szadowski’s celebration of church ceremonies also participated people of other faiths and religions.