Under the assumption that Schwa is not fully specified at the segmental and prosodic levels (Kehoe and Lle0 2003, van Oostendorp 1995, 1998, 2000) and that there are two types of schwa (reduction schwa and underlying schwa), I attempt to provide a diachronic account of schwa in Old English and Middle English. I argue that underlying schwa in Old English and Middle English. I argue that underlying schwa exists boty in Old English and in Middle English and surface realizations of schwa differ depending on the periods. It is shown that Reduction Rule and feature operations play a role in the realizations of schwa at the surface. The discussions of other phonological phenomena like the formation of syllabic consonants and Middle English Open Syllable Lengthening demonstrate that schwa plays a role in early English phonology.