Only one person created the monster. That’s according to a team of researchers at Harvard, Dartmouth, and elsewhere, who determined the epic poem “Beowulf,” a staple of literature classes the world over, was written by a sole author more than a millennium ago. The findings of the team, led by Madison Krieger, a postdoctoral fellow at Harvard’s Program for Evolutionary Dynamics, and Joseph Dexter, a Harvard PhD who’s now a Neukom fellow at Dartmouth College, were published April 8 in the journal Nature Human Behaviour, Harvard said in a statement.