(Henry). A poet in the reign of Henry IV. Justice Shallow says he saw Sir John Falstaff, when he was a boy, “break Skogan's head at the court gate, when he [Sir John] was a crack [child] not thus high.” (2 Henry IV., 2.)
Scogan? What was he? Oh, a fine gentleman, and a master of arts Of Henry the Fourth's times, that made disguises For the king's sons, and writ in ballad royal Daintily well.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894