William of Malmesbury's Historia Novella is an apologia for his pro-Angevin patron, Robert Earl of Gloucester, the premier supporter of the Empress Maud in the civil war with king Stephen (1135-1154). Stephen's failure to secure Robert of Gloucester's full backing weakened the reign from the outset. Robert, one of the two or three greatest landholders in the Anglo-Norman world, was among the last and most reluctant magnates to render Stephen homage, and among the first to turn openly against him. The earl of Gloucester became the model for the lay and ecclesiastical pro-Angevin nobility, and William of Malmesbury's panegyric of him guarantees the Historia Novella its place of importance among the sources for Stephen's reign.
Professor Robert B. Patterson has recently argued that the Historia Novella is inaccurate, mendacious, and unreliable, and that its author is unworthy of being called an historian. But a close analysis of Patterson's allegations shows that William's account of earl Robert's actions is consistent with evidence from charters and other chronicles. William of Malmesbury's bias lends interest to his account without seriously compromising its accuracy. The Historia Novella, William of Malmesbury's final work, is a characteristic product of his careful research and scholarship.
Patterson maintains that Robert of Gloucester did not support Maud until 1138, after the earl formally renounced his allegiance to Stephen. In fact, however, Robert was active in his half-sister's service as early as 1126.