Chettle, Henry(?) and Anthony Munday. The Death of Robert, Earl of Huntingdon (perf. 1598).

Drayton, Michael. England's Heroical Epistles (1597).

Drayton, Michael. Matilda: The Fair and Chaste Daughter of the Lord Robert Fitzwater (verse narrative, 1594).

(perhaps) Stowe, John. The Chronicles of England (1580).

(perhaps) Stowe, John. A Summary of the English Chronicles (1566).

REFERENCE : Joyce O. Davis, ed. Robert Davenport's 'King John and Matilda': A Critical Edition. New York: Garland, 1980. xv-xxxii.