How many Ruyang kings are there in history?

There are three Ruyang kings in history.

The first one is Li Xian, the king of Ruyang in the Tang Dynasty and the nephew of Li Longji in Xuanzong of the Tang Dynasty. He is very popular.

The second is Wang Yuan Siam in Ruyang, Northern Wei Dynasty. He is the great-grandson of Emperor Tuoba Hong of Mu Jing and the son of Wang Yuan Siam of Ruyang.

The third is Chahan Timur, the king of Ruyang in the Yuan Dynasty, who is an adopted son. He was named Kuokuotimuer by Shun Di, and was later named King Ruyang.