36 kings in 416 years – five dynasties
Lanna attacked Ayutthaya in 1507, 1508, and 1515; Lanna became a vassal of the Burmese in 1558
Ayutthaya first overrun by the Burmese in 1569; the second time was in 1767
Burmese-Siamese conflicts in 1535, 1549, 1563, 1569, and 1584
The Khmers invaded six times