Take History. Add Dragons. Stir until something explodes. Add more Kings, Emperors, Romans, Vikings, Conquerors, Spies, Warriors, Thieves, Knights, Nobles, and one Genius, to taste. Let simmer and take cover. A HTTYD Alt-History fic with a premise of: Take the first HTTYD film as canon, and then set that, gently, in the historical 1040s. And then stand back and watch the fireworks.