Pan left for France in 1686, accompanying the return of the 1685 French embassy to Siam of Chevalier de Chaumont. The embassy was bringing a proposal for an eternal alliance between France and Siam and stayed in France from June 1686 to March 1687. Pan was accompanied by two other Siamese ambassadors, Ok-luang Kanlaya Ratchamaitri and Ok-khun Sisawan Wacha, and by the Jesuit Father Guy Tachard