Reforms at the height of the Ayutthaya Kingdom (1470s)

Timeline

1. 1471–1474Ayutthaya royal palace · ThailandKing Borommatrailokkanat issued decrees quantifying the social status, military obligations, and judicial authority of nobles and commoners through sakdina (land-ranking units). The reform incorporated local strongmen into the royal hierarchy, regulated corvée labor and tribute collection, and laid institutional foundations for Ayutthaya's centralization.
2. 1474–1478Sukhothai–Chiang Mai border · ThailandAyutthaya and the northern Lan Na Kingdom repeatedly fought at Sukhothai, Nan, and elsewhere, contesting control of the northern Thai states. Military operations also occurred on the borders of Khmer vassal states. Though the wars drained national strength, Ayutthaya maintained its dominant position in western mainland Southeast Asia through the mid-to-late 1470s.
3. 1476–1480Patani · Pattani ProvinceThrough suzerain-vassal relations, Ayutthaya controlled northern Malay states including Patani and Kelantan, obtaining tin, spices, and other trade resources. The capital Ayutthaya gathered Chinese, Indian, Arab, and Southeast Asian merchants, becoming a hub of the Gulf of Thailand trade network. By 1480, the kingdom's administrative reforms and foreign trade advanced together, with national power on the eve of its zenith.