"The People of the Black Circle" by Robert E. Howard is a novella published in three parts in Weird Tales magazine in 1934. Set in a mythical prehistoric India, the story follows Conan as he kidnaps Princess Yasmina while battling the sinister Black Seers of Yimsha who plot world conquest. This tale of sorcery, political intrigue, and forbidden attraction is considered a classic of Conan lore, praised for its epic scope, Hindustan flavor, and deeper exploration of magic beyond typical sword-and-sorcery conventions.
Wikipedia page about this book: en.wikipedia.org/wiki/The_People_of_the_Black_Circle