Ekathotsarot

Sanpet III or Ekathotsarot was the King of Ayutthaya from 1605 to 1620 succeeding his brother Naresuan. His reign was mostly peaceful as Siam was then a powerful state through the conquests of Naresuan. Also during his reign that foreigners of various origin began to fill the mercenary corps. In particular, the king had a regiment of professional Japanese guards under the command of Yamada Nagamasa.51

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Source: Wikipedia