Emperor Taizong of Tang (born Li Shimin, January 23, 599 – July 10, 649) was the second emperor of the Tang Dynasty of China. He was the emperor who conquered all of China under Tang control. His ancestral name is Taizong. His rule of the Tang Dynasty earned him the nickname of "Rome of the East" by the Romans. His throne name was Zhenguan. This was considered one of the best times of rule in China. Taizong had three siblings: two brothers and a sister. They were: , and . 