John Sarkander was a Polish-Czech Catholic priest who lived from 1576 to 1620. After a brief marriage, he pursued his religious vocation and served as a priest in Holešov during a period of intense religious conflict. He is remembered for his steadfastness in protecting the seal of confession, refusing to reveal information shared during the sacrament despite being subjected to severe torture. His refusal to yield to his interrogators led to his death in Olomouc, where he is honored as a martyr.