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Tony messes around with an ancient mirror, which ends up sending him back a few centuries all the way to the 1800's

He needs a few things to get back to his era, and he's told by an artist that the only way he can get what he needs is through the king.

The king turns out to be Steve. Luckily for Tony, Steve comes across a painting of Tony that same artist created that day, and fell in love. He ordered the artist to find Tony and send him to the kingdom.