The author offers a new understanding of the rhetorical nature of allegorical poetry in the late Middle Ages. She shows that major English writers of that era - including Langland, Gower, Chaucer and the "Gawain" poet - offered in their works timely commentary on current events and public issues. Poems previously regarded as only vaguely political in their subject matter are seen by Astell to be highly detailed and specific in their veiled historical references, implied audiences and admonitions. Astell begins by describing the Augustinian and Boethian rhetorical principles involved in the invention of allegory. She then compares literary and historical treatments of key events in 14th- and 15th-century England, finding an astonishing match of allusions and code words, especially those deriving from puns, titles, heraldic devices and personal cognizances, as well as repeated proverbs, prophecies and exempla. Among the works she discusses are John Ball's "Letters" and parts of "Piers Plowman" which she presents as two examples of allegorical literature associated with the Peasants' Revolution of 1381; Gower's allegorical representation of the Merciless Parliament of 1388 in "Confessio Amantis"; and Chaucer's literary handling of key events in the reign of Richard II. In addition Astell argues for a precise dating of "Sir Gawain and the Green Knight" between 1397 and 1399 and decodes the work as a political allegory.