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U-thong dynasty (1351–1370)
The U-thong dynasty was originated by U-thong, a local ruler in central Thailand. In 1351, he founded the city of city of Ayutthaya on the Chao Phraya River, establishing the kingdom of the same name; he reigned with the regnal title of Ramathibodi.

Suphannaphum dynasty (1370–1388)
Ayutthaya was closely connected to the neighboring city of Suphan Buri ruled by the Suphannaphum dynasty, another branch of the family of Ramathibodi I. They ruled only in Suphan Buri until Borommarachathirat I usurped Ramesuan in 1370 and unified the two states. Under his rule, Sukhothai was also subjugated.

The dynasty is named for the city, originally founded as Dvaravati Sri Suvarnabhumi (ทพทวารวดีศรีสุวรรณภูมิ; ). Some historical scholars believe this etymology is evidence of Suphan Buri being the legendary Suvarnabhumi of Indian legend.

U-thong dynasty, restored (1388–1409)
In 1388, Ramesuan restored himself to the throne by capturing and executing Thong Lan. This reestablished the U-thong dynasty to the throne of Ayutthaya, but the effort was short-lived.

Suphannaphum dynasty, restored (1409–1569)
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