Fr Ioann Du, an Albazinian, was born in Beijing. He was sent on October 1943 to serve as protodeacon in the Pokrov Cathedral in Tianjin. From 1950 onward he served as the last rector of the St Innocent Mission Church in Tianjin. Activists of the Cultural Revolution forced themselves into the church and altar where he was standing, causing him immense anguish. He later died in Tianjin.