The Man Who Would Be King (1975) is a classic adventure drama directed by John Huston and starring Sean Connery and Michael Caine. The film follows two British adventurers, Daniel Dravot and Peachy Carnehan, as they travel to the remote region of Kafiristan
From Wikipedia
"The Man Who Would Be King" is an 1888 short story by Rudyard Kipling about two British adventurers in British India who become kings of Kafiristan, a remote part of Afghanistan. The story was first published in The Phantom 'Rickshaw and Other Tales (1888); it also appeared in Wee Willie Winkie and Other Child Stories (1895) and numerous later editions of that collection. It has been adapted for other media a number of times.