Events By place Asia The Xiongnu occupy the Gansu area in China. By topic Religion Council of Carthage: The biblical canon is definitely declared. The Candida Casa is founded by Saint Ninian, marking the beginning of missionary work among the Picts. Saint Sulpicius Severus writes the earliest biography of Saint Martin of Tours, the first known "life of a saint" ever written. Births Deaths April 4—St. Ambrose, bishop of Milan November 11—Saint Martin of Tours, bishop an… (More on 397)