 In a separate letter to Xie An, one of the most powerful figures in the Jin court, Xi Zuochi effuses solemnly about Shi Dao'an's monastic mastery, and advocates that the two ought meet.In 378, northern armies under Fu Jian besieged Xiangyang, and in 379 the city fell.Xi Zuochi and Shi Dao'an were taken to Fu Jian's capital at Chang'an.