The Feature of Comparison between Tang Taizong and Tang Xuanzong

The phenomenon,the emperor Offers King Titles to his sons,often happens in Chinese feudal society, the Tang Dynasty is in no exception.Among them,the period of Tang Taizong and Tang Xuanzong is the most representatives, they who Offer King Tides to his sons have their own features.Tang Taizong mosdy uses the very famous dukedoms' name in the period of Pre - Qin Dynasty;he not only dispatches his sons to some places to master the local military and the local government,but also enfeoffs his sons.However,Tang Xuanzong mosdy use the states' name to offer the king title,he arranges his sons to live in The Ten King Yards and he grants some official position to his sons,but his sons have no actual authority.