The two best-known manuscripts are the "Livre du cueur d'amour esprit" and the "Théséide", both in Vienna (Österreichische Nationalbibliothek, Codex 2597, 2617), dating from 1460–70, with sixteen and seven miniatures respectively. The "Livre du cueur d'amour esprit" was a courtly allegorical romance written (almost certainly) by René. This has spaces reserved for a further twenty-nine miniatures, and these are all completed in another manuscript by a much less brilliant artist, probably working from Barthélemy's drawings. This chivalric allegorical romance comes near the end of that tradition, and only allows Barthélemy's realism and human sympathy to be engaged in places. His exceptional skill at lighting effects is fully deployed; four of the sixteen miniatures are night scenes, and others show dawn or dusk with great brilliance. The larger and more populated scenes of the French translation of Boccaccio's "Il Teseida delle nozze d'Emilia", in theory about Theseus, in practice another romance, include magnificent scenes of urban life.