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alternatehistory.com
A man calling himself Dimitriy Ioannovich managed to become Tsar of Russia for ten months, from 1605 to 1606. He's even counted legitimately in the offical Tsar counts, which is rather exceptional for a pretender.
Your Alternate History Challenge/What-If Point, should you choose to accept it (), is finding a way to give this man a dynasty; it doesn't even need to last as long as the Romanovs. He just has to avoid pissing off the boyars...
So, have at it! Give me the broad strokes, if you will, and tell me how history would treat this man had he managed to become the victor. Give me a plausible POD, tell me what he could've done, and, above all... have fun!