Question: What author wrote a story about a  Dutch-American villager attributed to fictional historian Diedrich Knickerbocker?
Sentence (from "Knickerbocker Group"): The Knickerbocker Group was a somewhat indistinct group" of writers, notably Washington Irving, James Fenimore Cooper, and William Cullen Bryant, who were American pioneers in the literary fields of general literature, novels, and poetry and journalism, respectively.
Relevant evidence: No