Why then

V. Kyd's Spanish Tragedy. [Eliot's note] Subtitled "Hieronymo's Mad Againe," Kyd's play (1594) is an early example of the Elizabethan tragedy of revenge. Hieronymo, driven mad by the murder of his son, has his revenge when he is asked to write a court entertainment. He replies, "Why then Ile fit you!" (i.e. accomodate you), and assigns the parts of the entertainment so that, in the course of the action, his son's murderers are killed. (NA)