This long-forgotten tale of the shipwreck off the coast of Africa of a Siamese embassy to Lisbon in 1686 lay buried in the text of a French book printed 300 years ago. The author of the text was the intrepid and intriguing Jesuit Tachard, who published accounts of his first two journeys to Siam. In his second book, written when he was King Narai's personal envoy to Louis XIV and Pope Innocent XI, Tachard relates the account of the shipwreck as told by one of its survivors, Ok-khun Chamnan Chaicong, who was accompanying Tachard on his return to France.

Ok-khun Chamnan, during his...