I just read two great books by the same guy: Steven Pressfield. One is called "Gates of Fire" about the Spartans getting wiped out at Thermopylae, and the other was "Tides of War" about the Pelopennesian War (Athenians vs. Spartans). It's historical fiction. This writer really makes the ancient world come alive. The battle scenes are amazing.
I also read one called "Will in the World" about Shakespeare. Good read if you want to find out about who he was and the times he lived in (which were a hell of a lot nastier and meaner than I knew).