E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
The blade-bone of a shoulder of mutton, so called in Scotland. In some parts of England it is termed a poor knight of Windsor, because it holds the same relation to Sir Loin as a Windsor knight does to a baronet. Sir Walter Scott tells of a Scotch laird who, being asked by an English land-lord what he would have for dinner, produced the utmost consternation by saying, I think I could relish a morsel of a poor man. (See Bride of Lammermoor, chap. xix.)