Pan (Thai: ปาน), known by his rank Chao Phraya Kosathibodi
(Thai: เจ้าพระยาโกษาธิบดี, or Minister of Foreign Affairs and
Trade) or former rank Ok Phra Wisut Sunthon (Thai:
ออกพระวิสุทธิสุนทร, or First-Class Diplomat) or by the nickname
Kosa Pan (Thai: โกษาปาน), was a Siamese diplomat and minister
who led the Second Siamese Embassy to France sent by king Narai
in 1686. He was preceded to France by the First Siamese Embassy
to France, which had been composed of two Siamese ambassadors
and Father Bénigne Vachet, who had left Siam for France on
January 5, 1684. He is a Nephew of King Ekathotsarot and a Great
grandfather of King Buddha Yodfa Chulaloke of Chakri Dynasty.
His brother, Lek (Thai: เหล็ก), also ranked Chao Phraya
Kosathibodi before him.  Embassy to France (1686) Kosa Pan left
for France in 1686, accompanying the return of the 1685 French
embassy to Siam of Chevalier de Chaumont and François-Timoléon
de Choisy on two French ships. The embassy was bringing a
proposal for an eternal alliance between Franc