Jadwiga of Poland
Maciejowski started reforming the Polish Church in the spirit and teachings of the Council of Trident. In his capacity of the archbishop of Poland was a follower of the Counter-Reformation, and he endorsed and sought to venerate Jadwiga of Poland and her "black Crucifix" located at the Wawel Cathedral. Since 1603 he had promoted the veneration of John Cantius, future saint.