Shelley's Prometheus Unbound in many ways might be considered the most significant and characteristic of his works. Yet in this drama the poet himself has pointed out his indebtedness to the Prometheus Bound of Æschylus. Able scholars, in turn, have examined the relationship between the English and the Greek plays. Over half a century ago Vera D. Scudder published her study, and in 1908 Richard Ackermann brought out his critical commentary. Among others, W. J. Alexander and A. M. D. Hughes, in editing their selections from the poems of Shelley, noted the parallels between his work and that of Æschylus. In more recent times, Carl Grabo has gone beyond the study of Greek-English parallels, and Newman Ivey White in the notable twenty-second chapter of his Shelley has enriched our understanding of Prometheus Unbound. Still one may hope by concentrating on the problem to give fuller meaning to the action of the mind of Æschylus upon that of Shelley as together they face tyranny and pain.