The Vision of Piers Plowman is a satirical poem by W. [or R.] Langland, completed in 1362. The poet supposes himself falling asleep on the Malvern Hills, and in his dream sees various visions of an allegorical character, bearing on the vices of the times. In one of the allegories, the Lady Anima (the soul) is placed in Castle Caro (flesh) under the charge of Sir Constable Inwit, and his sons See-well, Hear-well, Work-well, and Go-well. The whole poem consists of nearly 15,000 verses, and is divided into twenty parts, each part being called a passus, or separate vision.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894