The source for the Fitzallen subplot in A Fair Quarrel is one of the stories in the Hecatommithi of Cinthio.
Shirley based his plot on material from two sources: novel 36 of the Heptameron of Marguerite of Navarre, and novel 6, decade 3, of the Hecatomithi of Cinthio.
Giovanni Battista Giraldi Cinthio, in the mid-sixteenth century, both argued that the tragedy-with-comic-ending (tragedia de lieto fin) was most appropriate to modern times and produced his own examples of such plays.
Don Giovanni | Giovanni Pierluigi da Palestrina | Giovanni Bellini | Giovanni Riggi | Giovanni Boccaccio | Giovanni Battista Pergolesi | Giovanni Battista Tiepolo | Giovanni Battista Guarini | Giovanni | Giovanni Trapattoni | Giovanni "John the Eagle" Riggi | Giovanni Gabrieli | Leon Battista Alberti | Giovanni Falcone | Villa San Giovanni | San Giovanni in Persiceto | Giovanni Verga | Giovanni van Bronckhorst | Giovanni Tamagno | Giovanni Pacini | Giovanni Battista Pescetti | Giovanni Papini | Giovanni Hidalgo | Giovanni Domenico Cassini | Giovanni de' Medici | Giovanni Bottesini | Giovanni Battista Riccioli | Giovanni Zenatello | Giovanni Visconti | Giovanni Schiaparelli |
His play Canace, based on a Greek legend of incestuous love, was only performed once; but was widely diffused, and (together with Giraldi's play Orbecche) led to literary debates on tragedy and theatrical morals through to the next century.