Borommatrailokanat

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King Borommatrailokanat (often short Trailok, Thai: สมเด็จพระบรมไตรโลกนาถ, 1431-1488) was king of Ayutthaya 1448-88.

Born as Prince Ramesuan, he followed his father Boromma Ratchathirat II as king in 1448, then adopting the name Borommatrailokanat. In 1463 he moved his capital to Phitsanulok. Lanna had unsuccessfully besieged the town in 1459 and 1460, and also Sukhothai rebelled, weaking the northern boundary. The move of the capital was performed to strengthen his control in this area.

The traditional ministries of Thailand - the Kalahom for the military and the Mahatthai as the civilian duties - were introduced by Trailok. Also in his reign the hierarchies of the nobility were first codified, petty official having a sakdi na (field power, with one field measuring 1 rai = 0.16 acre) of 50 to 400, up to 100,000 for the uparat (hier-apparent). These structure were continued until the reforms of King Chulalongkorn at the end of the 19th century.