As Chang'an was often hot during the summer, Emperor Taizong often invited Emperor Gaozu to go with him to Jiucheng Palace (九成宮, in modern Baoji, Shaanxi), to avoid the heat during the summer.
Da Chang'an ofte var varm om sommeren, inviterede kejser Taizong ofte kejser Gaozu til at gå med ham til Jiucheng Palads (九成宮, i moderne Baoji, Shaanxi]) for at undgå varmen om sommeren.