(perhaps) Geoffrey of Monmouth. Historia Regum Brittaniae (MS., wr. C12).

(perhaps) Grafton, Richard. A Chronicle at Large (1568).

(perhaps) Matthew of Westminster. Flores Historiarum (f. pr. 1567).

(perhaps) Vergil, Polydore. An Abridgement of the Notable Work of Polydore Vergil. Ed. Thomas Langley (1546).

REFERENCE : G.E. Bentley. The Jacobean and Caroline Stage. 6 vols. Oxford: Oxford University Press, 1941-68.