King Borommarachathirat I or King Borom Rachathirat I (), also known as Khunluang Pha Ngua (); 1370–1388), was the third king of

Ayutthaya Kingdom The Ayutthaya Kingdom or the Empire of Ayutthaya was a Thai people, Thai kingdom that existed in Southeast Asia from 1351 to 1767, centered around the city of Phra Nakhon Si Ayutthaya (city), Ayutthaya, in Siam, or present-day Thailand. Europe ...

.Chakrabongse, C., 1960, Lords of Life, London: Alvin Redman Limited He was the older brother of King U-thong's consort, and was King Ramesuan's uncle. As the lord of

Suphanburi Suphan Buri () is a town ('' thesaban mueang'') in central Thailand. It covers ''tambon'' Tha Philiang and parts of ''tambons'' Rua Yai and Tha Rahat, all within the Mueang Suphan Buri District. As of 2006 it had a population of 26,656. The tow ...

, a powerful rival of Ayutthaya, he forced King Ramesuan from power and took the throne of

Ayutthaya Ayutthaya, Ayudhya, or Ayuthia may refer to: * Ayutthaya Kingdom, a Thai kingdom that existed from 1350 to 1767 ** Ayutthaya Historical Park, the ruins of the old capital city of the Ayutthaya Kingdom * Phra Nakhon Si Ayutthaya province (locall ...

. Known as a great warrior, his reign marked the expansion of Ayutthaya to the north. He suppressed a rebellion in

Sukhothai Kingdom The Sukhothai Kingdom was a post-classical Siamese kingdom (Mandala (political model), ''maṇḍala'') in Mainland Southeast Asia surrounding the ancient capital city of Sukhothai Historical Park, Sukhothai in present-day north-central Thaila ...

(1371–78) and subjugated major northern powers such as

Phitsanulok Phitsanulok (, ) is a city municipality in northern Thailand and the capital of Phitsanulok province. It had a city population of 60,827 and an urban population of approximately 200,000 in 2024, making it Thailand's 19th-most populous city p ...

. Invading

Chiang Mai Chiang Mai, sometimes written as Chiengmai or Chiangmai, is the largest city in northern Thailand, the capital of Chiang Mai province and the List of municipalities in Thailand#Largest cities by urban population, second largest city in Thailan ...

, his forces were defeated and repulsed at the Battle of Sen Sanuk, near Chiang Mai.p. 431, 'The Collins Encyclopedia of Military History' (4th edition), Dupuy & Dupuy, 1993. After his death in 1388, his son, Thong Lan reigned for only a week. Ramesuan, who had previously retreated to Lavo, returned and toppled him. Ramesuan eventually assumed the throne, as the king for the second time.

References

{{DEFAULTSORT:Borommarachathirat 1 Suphannaphum dynasty Kings of Ayutthaya 1388 deaths Year of birth unknown 14th-century monarchs in Asia 14th-century Thai people