Proposed intertexts would include but would not be limited to:

The Tudor histories of the Perkin Warbeck conspiracy mentioned in Mary Shelley's Preface such as Francis Bacon's History of Henry the Seventh and Raphael Holinshed's Chronicles of England, Scotland, and Ireland (1587/1807); David Hume's Georgian History of England, from the Invasion of Julius Cæsar to the Revolution in 1688 (1754-1762); and counter-histories such as Horace Walpole's Historic Doubts on the Life and Reign of King Richard the Third (1768) and John Bayley's The Histories and Antiquities of the Tower of London with Biographical Anecdotes of Royal and Distinguished Persons (1821).

Excerpts from other novels, poems, and ballads featuring the 15th century imposter such as Alexander Campbell's Perkin Warbeck; or the Court of James the Fourth of Scotland, also published in 1830, as well as dominant cultural texts such as Shakespeare's Richard III and counter-texts such as John Ford's The Chronicle History of Perkin Warbeck, A Strange Truth (1634).

Excerpts of serialized Peninsular novels or reports on the Peninsular Campaigns, such as Thomas Hamilton's Letters from the Peninsula serialized in Blackwood's Magazine, a journal Shelley is likely to have read and therefore representative of the kind of cultural discourse against which and within which Shelley crafted her Spanish chapters.

Excerpts from Washington Irving's Chronicle of the Conquest of Granada, the subject of one of the two footnotes in Shelley's novel and a work she implies she would have liked to have written herself.

William Godwin's essay "Of History and Romance" (1797), excerpts from his writings on Chivalry (for example excerpts from his Life of Geoffrey Chaucer, the Early English Poet (1803) as well as excerpts from Caleb Williams (1794), and his Lives of Edward and John Philips, Nephews and Pupils of Milton (1815), both of which contextualize Shelley's novel as part of a particular radical tradition that looks over its shoulder at not only Milton but Cervantes as well), and excerpts from his History of the Commonwealth of England (1824-1828), the magnum opus on which Godwin was working while Mary Shelley was composing her novel and on which she collaborated.

Relevant pieces by Sir Walter Scott on historical writing such as the introduction to Ivanhoe (1819)

Excerpts from other of Mary Shelley's historiographical writings, and in particular her Life of Cervantes.

Excerpts from Mary Shelley's correspondence, in particular her letters querying publishers and searching for research materials (in particular her correspondence with Thomas Croker, Sir Walter Scot, Thomas More, and William Godwin)