 In order for the state to reclaim dry, barren areas of land, the state further developed this system by dividing up the land according to the number of men of an age to cultivate it.The Sui and Tang Dynasties later resurrected this system in the 7th century.During the reign of Emperor Daowu (386-409), the total number of deported people from the regions east of Taihangshan (the former Later Yan territory) to Datong was estimated to be around 460,000.