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The wikipedia entry for Talbot Mundy:
Born in London, at age 16 he ran away from home and began an odyssey in India, Africa, and other parts of the Near and Far East. By age 29, he had begun using the name Talbot Mundy, and a year later arrived in the United States, starting his writing career in 1911.
His first published work was the short story "Pig-Sticking in India", which describes a popular, though now outlawed, sport practiced by British forces.
Many of his novels, including his first novel Rung Ho!, and his most famous work King of the Khyber Rifles, are set in India under British Occupation in which the loyal British officers encounter ancient Indian mysticism. The novels portray the citizens of Imperial India as enigmatic, romantic and powerful. His British characters have many encounters with the mysterious Thugee Cults. The long buildup to the introduction of his Indian Princess Yasmini and the scenes among the outlaws in the Khinjan Caves clearly influenced fantasy writers Robert E. Howard and Leigh Brackett.
His related Jim Grim series, which has mystical overtones and part of which is available over the web from theosophical sites, ran in Adventure magazine before book publication. Mundy was associated with Theosophy's movement, a friend of Katherine Tingely
Beginning in the late 1920s Mundy wrote a number of stories about Tros of Samothrace, a Greek freedom fighter who aided Britons and Druids in their fight against Julius Caesar.