János Brenner was a Hungarian Cistercian priest who lived from 1931 to 1957. During a period of intense communist persecution in Hungary, he continued his religious studies despite the suppression of monastic houses. Serving as a chaplain in St. Gotthard, he refused to leave his post even after receiving threats from authorities. His dedication to his ministry led to his death in 1957, when he was ambushed and murdered while traveling to administer last rites to a sick person. He is recognized as a blessed martyr in the Catholic Church.