The concept of an author, the single creative person who gives the text 'authority', only comes later in this period. Most Old English poetry is anonymous, even though names which are in no way comparable, such as Caedmon and Deor, are used to identify single texts. Caedmon and Deor might indeed be as mythical as Grendel, might be the originators of the texts which bear their names, or, in Deor's case only, the persona whose first-person voice narrates the poem. Only Cynewulf 'signed' his works, anticipating the role of the 'author' by some four hundred years.