professionally qualified architects and engineers (Maria Mateusz Szymanowski [pl] and MariaBartłomiejPrzysiecki [pl]) who brought into the church considerable
experienced architect/engineers among the Mariavite priests, Szymanowski and Przysiecki, who delivered the plans and oversaw the construction. The Mariavites
Roman Maria Jakub Próchniewski (February 29, 1872 in Congress Poland - February 13, 1954 in Płock, Poland) was the Prime Bishop of the Mariavite Old Catholic
Klemens Maria Filip Feldman, Bishop-Primate (1935–1945) Roman Maria Jakub Prochniewski, Bishop-Primate (1945–1953) Waclaw MariaBartlomiejPrzysiecki, Bishop-Primate