1) Frankenstein was created by the English author, Mary Shelley, in 1818, when she was just 20 years old. What she accomplished during that time in history being a female fictional writer, is beyond extraordinary. She was the first J.K. Rowling.
2) Count Dracula was created by the amazing Bram Stoker in 1897. No other fictional character comes close to having as many books, movies, and television shows, written about it than Dracula.
3) There isn't concrete information as to when or where the Werewolf story came from, but it certainly was folklore in Europe in the 1500s. Although no story behind it, a painting that looked like a werewolf (part man and part wolf), was discovered in Greece and determined to be from around 400 B.C.