alternatehistory.com

So I've recently got into Japanese history and noticed that it is unique in regards to the Shogunate system. Many nations have had civil wars and changed monarchs and even dynasties but only one that I can think of had one dynasty act as hereditary regents (for that what the Shoguns pretty much were) for another dynasty, and that was the early Charlemagne dynasty on behalf of the Merovingians, though even they eventually deposed the rightful rulers. So how could we see a system similar to that of the Shogunate come about in Europe? Would it even be possible?
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