The name Hulao, or "Tiger Cage", came to be when King Mu of Zhou trapped a tiger in this place. It also had the name of Wulao Pass () at one time in the Tang dynasty, due to a naming taboo — the grandfather of Emperor Gaozu of Tang was named Li Hu.
The name Hulao, or "Tiger Cage", originated when King Mu of Zhou captured a tiger in that area. It was also known as Wulao Pass () during the Tang dynasty due to a naming taboo – Emperor Gaozu's grandfather had the same name as Li Hu.