The Last of the Barons, Book IX by Edward Bulwer-lytton

The events that followed this tempestuous interview were such as the position of the parties necessarily compelled. The craft of Louis, the energy and love of Prince Edward, the representations of all her kindred and friends, conquered, though not without repeated struggles, Margaret's repugnance to a nearer union between Warwick and her son. The earl did not deign to appear personally in this matter. He left it, as became him, to Louis and the prince, and finally received from them the proposals, which ratified the league, and consummated the schemes of his revenge.

Upon the Very Cross [Miss Strickland observes upon this interview: "It does not appear that Warwick mentioned the execution of his father, the Earl of Salisbury, which is almost a confirmation of the statements of those historians who deny that he was beheaded by Margaret. "] in St. Mary's Church of Angers, Lord Warwick swore without change to hold the party of King Henry. Before the same sacred symbol, King Louis and his brother, Duke of Guienne, robed in canvas, swore to sustain to their utmost the Earl of Warwick in behalf of King Henry; and Margaret recorded her oath "to treat the earl as true and faithful, and never for deeds past to make him any reproach."