Heather James argues that Shakespeare's use of Virgil, Ovid and other classical sources demonstrates the appropriation of classical authority in the interests of developing a national myth. She goes on to distinguish Shakespeare's deployment of the myth—notably in Troilus and Cressida, Antony and Cleopatra, Cymbeline, and The Tempest—from "official" Tudor and Stuart ideology, and to show how Shakespeare participates in the larger cultural project of finding historical legitimacy for Britain as a realm asserting its status as an empire.