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Si Saowaphak or Sanphet IV was a short-reigning king of Ayutthaya of the Sukhothai dynasty in 1610/11. Prince Si Saowaphak was the son of King Ekathotsarot and had an elder brother Prince Suthat who was made the Uparaja in 1607 but died before his father. Prince Si Saowaphak, as his father's second son, was expected to be invested the title of Crown Prince. However, Ekathotsarot never appointed him the Uparaja.