ANSWER : A series of rebellions in the outer areas.
The Tang Dynasty was just like many other ancient Chinese dynasties. It was one monarchy that was ruled by a very powerful emperor founded by the Li family in the year 618.
In 907 the Tang dynasty was ended when Zhu Wen, now a military governor, deposed the last emperor of Tang, Emperor Ai of Tang, and took the throne for himself (known posthumously as Emperor Taizu of Later Liang). He established the Later Liang, which inaugurated the Five Dynasties and Ten Kingdoms period.