I don't know where the idea came from to write an Eaglethorpe Buxton story, but he does owe a lot to several other authors and stores. His origin as a medieval story-teller comes right out of D&D and in fact the world in which he lives (including the Queen of Aerithraine) is from the D&D campaign I started as a young man and continued right up until my kids and I used to play.
Eaglethorpe's line "The Queen of Aerithraine, with whom I once had the pleasure to spend a fortnight" is pretty much
In order to make the plot work, Eaglethorpe had to be a bit heroic. He knows how to handle himself with a sword. He can kick the crap out of goblins. But he's not the hero he thinks he is.