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Lan Na–Siam Border Conflict

Type Event Region Southeast Asia Time 1441

Around 1441, the Lan Na kingdom and Siam's Ayutthaya dynasty clashed along the upper Chao Phraya and northern borderlands over vassals and trade rout…

Timeline

  1. 1441Chiang Mai · ThailandLan Na king Tilokaraja and Ayutthaya of Siam disputed the allegiance of northern vassals and the right to levy taxes on trade routes; after negotiations between envoys broke down, border garrisons fell into mutual alert.
  2. 1441Lan Na–Siam northern border · ThailandLan Na forces marched south and engaged Ayutthaya border troops around frontier fortresses; both sides won and lost without achieving a decisive breakthrough, and the war ended with a localized truce and the border roughly maintaining its pre-war posture.

Sources