Quirinus of Sescia was a 4th-century bishop and martyr who lived in the Roman province of Pannonia. Born in Sisak around 300, he served as a leader of the Christian community in Sescia. During the persecutions under Diocletian, he was arrested and eventually sent to Sabaria. There, after refusing to renounce his faith, he was executed by being thrown into the Gyöngyös River with a millstone tied to his neck. He is remembered as a significant figure in the early church and is honored in various Christian traditions.