Claim: Louis T. Leonowens was concocted in Anna and the King of Siam.
Evidence: Louis Thomas Gunnis Leonowens -LRB- 25 October 1856 -- 17 February 1919 -RRB- was a British subject who was the basis of a major character in the 1944 novel Anna and the King of Siam , as well as other fictional works based on it -LRB- see below -RRB-.
Anna and the King is a 1944 semi-fictionalized biographical novel by Margaret Landon.