As has been pointed out already, if you haven’t read the original Robert E Howard stories you are missing out on the foundation of modern fantasy/swords and sorcery. Ballantine has released his works in unaltered form. This is very important to note as after his death 70 years ago, most of the material published with his name on it was altered/blasphemed by certain other writer/editors.
Poul Anderson wrote several mytho/historical works on the Norse that are very good and based in real history and myth as we know it: Mother of Kings, Hrolf Kraki saga, War of the Gods, and the Last Viking trilogy.
If you have the fortitude to read them, the original DUNE books by Frank Herbert are masterpieces of Science Fiction.