This paper deals with the metrical behavior of a class of verbs in Old English whose descendants became the syntactically distinct auxiliaries of the modern period (have, be, may, will, shall, and associated forms). Contrasting two poems from the Old English period (Beowulf and The Battle of Maldon), I show that while the verbs in question show consistently stressed metrical placement in Beowulf, in Maldon they show a pronounced tendency to be placed in unstressed metrical positions, while verbs outside the eventual class of auxiliaries differ indiscriminately. In this way, the poetry suggests a phonological difference between pre-auxiliaries and other verbs perhaps centuries before corresponding morphological and syntactic differences fully emerged in the Middle and early Modern English periods.