one of many easter eggs in Game there a so many of them this is from "The Legend of Sleepy Hollow" there are also some things from LoTR like the tree in Whiterun like the White Tree in Minas Tirith. Also some things from Star Trek, Star Wars, King Arthur and so one just look around they make a great job
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Who came riding to Whiterun from ole Rorikstead
And the braggart did swagger and brandish his blade
As he told of bold battles and gold he had made
But then he went quiet, did Ragnar the Red
When he met the shield-maiden Matilda, who said;
"Oh, you talk and you lie and you drink all our mead
Now I think it's high time that you lie down and bleed!"
And so then came clashing and slashing of steel
As the brave lass Matilda charged in, full of zeal
And the braggart named Ragnar was boastful no more-
When his ugly red head rolled around on the floor!
Also some things from Star Trek, Star Wars, King Arthur and so one just look around they make a great job
http://www.uesp.net/wiki/Skyrim:Headless_Horseman