BICYCLE RIDE IN THE WALLS OF THE CITADEL objective of the great width of the wall of Xi'an is that the soldiers could move her horse without problemas.La Xian wall was ordered built in the fourteenth century by Emperor Zhu Yuanzhang of the Ming dynasty, on the advice of a consultant to conquer every city should be protected from future attacks by a great wall. And he did, so that extended and strengthened the old city wall of Xian, built during the Tang Dynasty predecent.