This thread is for weird situations in CK II, so let me introduce:
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Yes, it is Karl the Great. He was easily beaten by Karloman, after that run to Saxons, turned Frisian and end his life as simple commoner. His dynasty weren't luckier. Kingdom after Kingdom, duchy after duchy - all was lost to random minor dynasties, which made map of Western Europe more and more bordergoring.
Currently, the last Karling ruler is merely, inprisoned duke of Gerle under King of Aquitannia.
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That is Western Europe. Ummayads fall under random vassals' revolt, which take them out Sultanate of Andalusia, currently ruled by Shia Caliph. Bretons united and decided to colonize Castille, British Isles is a mess (as always), one of Anglo-Saxon rulers inherited duchy of Mumu and decided to take it as his primary title, Avars falls into hands of Bohemians, who currently control Bohemia, Pannonia, Croatia and Serbia. Lombardy survived and colonized Northern Africa (as always).
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This guy is my favorite. His is a younger brother of Ragnar Woollen Shorts, decided to settle in Duchy of Finland and quickly was assimilated by local culture. His descendants went even further, turned finish paganism and ruled Duchy of Finland until was conquered by holy war by my country.
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Sounthern Finland and whole Denmark are under my control, while Saxony (still Germanic) inherited Kingdom of Norway and control it all time. Sweden was united by Af Munso dynasty (first king was Ragnar Woollen Shorts).