Nice quiz, though many of these empires had more than one capital city. Also, you should definitely accept Tehnochitlan for the Aztec Empire at the very least as an alternate type-in, if you don't change the answer altogether. If you want to be consistent, though, you should change the answer since you don't accept Istanbul as the capital of the Byzantine Empire.
Yeah I realised that Tenochtitlan was the capital, though I thought this might be too hard to spell so decided to leave it at Mexico city, apologies my first quiz ill add it in.
What a great idea for a quiz! This is my favorite quiz of the day and I'm awarding it an Ozchris 5/5 gold stars! :) Top stuff Barry! (See not everyone on JetPunk is a miserable so and so.) lol