Ayutthaya–Lan Na War (1441–1474) Ayutthaya–Lan Na War (1441–1474) The Ayutthaya–Lan Na War, was a border conflict that took place between 1441 and 1474. It started when the southern kingdom of Ayutthaya invaded the northern kingdom of Lan Na in 1441 and continued with periodic breaks until 1474. Lan Na achieved limited territorial gains but was weakened by internal power struggles and losses sustained during the conflict. Ayutthaya formed what is now the central and southern parts of modern Thailand while Lan Na approximated northern Thailand. During the 15th century the Ayutthaya Kingdom fought frequent wars against the Lan Na Kingdom in the north, the
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