Question: Who is Si Saowaphak's uncle?
Sentence (from "Ekathotsarot"): Ekathotsarot  or Sanphet III (in or after 1556 – 1620) was the King of Ayutthaya from 1605 to 1620 and overlord of Lan Na from 1605 to 1608/09 succeeding his brother Naresuan.
Relevant evidence: Yes