Affairs of the Ayutthaya Kingdom

Timeline

1. 1411–1415Ayutthaya · ThailandDuring Intharacha I's reign, court administration was reorganized and the legitimacy of rule was strengthened by combining Buddhism with royal authority. As a commercial and agricultural center of the lower Chao Phraya River, Ayutthaya's population and tax base continued to expand, laying institutional foundations for the kingdom's later expansion.
2. 1412–1418Former Sukhothai lands and the Khorat Plateau · ThailandThe kingdom gradually annexed or controlled the successor cities of Sukhothai and extended influence onto the Khorat Plateau. Border friction with the northern Lan Na Kingdom occurred from time to time, but both sides also avoided full-scale war through exchanges of envoys. Ayutthaya thereby became the most powerful single polity on the Siamese peninsula.
3. 1415–1420Port of Ayutthaya and vassal ports of the southern Malay Peninsula · ThailandAyutthaya reached the sea via the Chao Phraya River, participating in the South China Sea trade network and exporting rice, tin, ivory, and forest products. The kingdom maintained commercial contacts with Ming China and ports such as Malacca, and foreign merchants (including Chinese and Arab) traded in the capital, promoting Siam's economic prosperity in the early 15th century.