In 1854, Knox married a Siamese woman of high position, Prang, daughter of Phya (Count) Somkok and Mâe Yen of Somkok and Bangkok. [3 ] Their younger daughter Caroline married Louis T.
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In 1860, Prang fled Prussia to Boston, where he and a partner set up a Boston-based printing company specializing in lithographic prints of buildings and towns around Massachusetts.