(perhaps) Bandello, Matteo. Novelle (1554). 1.42 ('Didaco and Violente').

(perhaps) Boaistuau, Pierre. Histoires Traguiques (collection of tales, 1559). Story 5.

Maximus, Valerius. Factorum et Dictorum Memorabilium Libri Novem.

(perhaps) Painter, William. The Palace of Pleasure (collection of tales, 1566-7). Tome 1, Novel 42 ('Didaco and Violenta').

(perhaps) Sidney, Philip. The Countess of Pembroke's Arcadia (1590). Bk. 3, Ch. 12-16.

REFERENCE : T.W. Craik, ed. The Maid's Tragedy. The Revels Plays. Manchester: Manchester University Press, 1988. 3-8.