Antoni Leszczewicz was a Polish Catholic priest who dedicated much of his life to missionary work in Asia. Born in 1890 in Abramaŭščyna, he studied in Saint Petersburg before being ordained in 1914. After serving as a vicar in Irkutsk, he moved to Harbin in 1920, where he established various community structures, including a school, a nursery, and the St. Josaphat church. In 1937, he joined the Congregation of Marian Fathers, eventually serving as a mission superior during the Second World War.