Citation Hunt

The Wikipedia snippet below is not backed by a reliable source. Can you find one?

Click I got this! to go to Wikipedia and fix the snippet, or Next! to see another one. Good luck!

In page Thong Lan:

"

The Kingdom of Ayutthaya was jointly founded by the royal houses of Uthong and Suphannaphum, which were related through marriage.[1] The first monarch of Ayutthaya, Ramathibodi I, was from Uthong. He appointed his son, Ramesuan, the ruler of Lop Buri.[2] He also appointed Boromrachathirat I, his relative from Suphannaphum, the ruler of Suphan Buri.[3]