Blessed Jeong Yak-jong (1760 – April 8, 1801), also known as Augustine Chong, was a Roman Catholic Korean martyr who contributed greatly to the spread of Catholicism in Korea. He was an older brother of Jeong Yak-yong and father of Saint Paul Chong Hasang. He wrote the first Catholic Catechism using only Korean letters so that he could reach out to the common people as well as the nobles who were the only ones in Korean society who could read Chinese characters. He was first converted to Catholicism himself by Chinese priest Chou Wen-Mu. he was Beatified by Pope Francis on August 16, 2014. along with Paul yun ji Chung and 122 Martyr Companions.