Well I think the time period it would be in would be mid evil because of the weapons and armor. I can't remember when that was but I know it is earlier than the end of the Byzantine Empire( for those who don't know what that is part of the Roman Empire when it fell) because the intruders used cannons. And we know that none of the dragons have cannons.

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Wings of Fire Theories
FanfictionThis is a place where everyone's opinion is accepted! I will put my theories in this and you can put your guys' in the messages. Enjoy! Also don't read unless you have read all the books! Spoiler alert! also Cover by @Dragonlover0234 !