History books for 8 year old

Hello! I am looking for suggestions on history books for an 8 year old. To give you an idea of topics he's found interesting: mythology (he has read a bit about Greek mythology and is curious to learn about Roman mythology, how is it similar/different to Greek), WW II (I got him the Guts and Glory WWII book by Ben Thompson, and while some of it is quite technical, he's enjoyed some stories. So far the story of Voytek has been his favorite), the story of Vercingetorix & Caesar. In general he likes history, so if anyone has any suggestions on general history, that would be great. In case it is relevant, my son's reading is pretty good, he can be very dedicated to book series, but he needs to be interested in it (makes sense for his age, I think). Thank you!