Ayutthaya's Early 15th-Century Expansion (Eve of Borommaracha II's Reign)

Name: Ayutthaya's Early 15th-Century Expansion (Eve of Borommaracha II's Reign)
Start: 1409
End: 1424

Type Event Region Southeast Asia Time 1409–1424

Around 1409 CE, the Kingdom of Ayutthaya under Intharacha I consolidated control over the middle and lower Chao Phraya River and gradually suppressed…

Timeline

1409–1415Ayutthaya · AyutthayaAround 1409, Intharacha I strengthened his rule over the Chao Phraya plain, reducing Sukhothai to a vassal under garrisoned control; Ayutthaya became the center of Thai political power, and the Borommaracha line within the royal house rose in power.
1415–1424Chao Phraya River basin · CentralBetween 1415 and 1424, Ayutthaya continued integrating its vassal states and preparing military operations toward the Khmer and Lanna; after Borommaracha II acceded in 1424, this expansionist policy reached its height.

Sources

Ayutthaya kingdom https://www.britannica.com/place/Ayutthaya-kingdom
Royal Chronicles of Ayutthaya