Solomon Kane, as I'm sure you know, was one of Robert E. Howard's first major series characters. Kane, a grim-faced puritan who battled sorcery with his sword, made his first appearance in the story "Red Shadows" in the August 1928 issue of Weird Tales. But here's proof that W.C. Tuttle, the creator of Hashknife Hartley and Sheriff Henry Conroy, employed the name five years earlier here in the August 10, 1923 issue of Adventure.
The two characters are as different as can be, of course, but the name figures prominently here, and it's well known that Adventure was Howard's favorite magazine. Did 17-year-old Robert E. read this one? What do you think?