literary scholar and jesuit father peter milward and the writer clare asquith are among those who have written that catholic sympathies are detectable in shakespeare's works. asquith believed that shakespeare uses terms such as "high" when referring to catholic characters and "low" when referring to protestants (the terms refer to their altars) and "light" or "fair" to refer to catholic and "dark" to refer to protestant, a reference to certain clerical garbs. asquith also detects in shakespeare's work the use of a simple code used by the jesuit underground in england which took the form of a mercantile terminology wherein priests were 'merchants' and souls were 'jewels', those pursuing them were 'creditors', and the tyburn gallows, where the members of the underground died, was called 'the place of much trading'. the jesuit underground used this code so their correspondences looked like innocuous commercial letters, and asquith believed that shakespeare also used this code. asquith's conclusions, however, have met with considerable criticism and evidence of a hidden code has been called "dubious". according to professor jeffrey knapp, the work of scholars like peter milward, who believe that "the deepest inspiration in shakespeare's plays is both religious and christian", has had "little influence on recent shakespeare scholarship". john finnis and patrick martin have argued more recently that catholic martyr anne line is the eponymous phoenix of "the phoenix and the turtle" and her husband roger is the eponymous turtle. they believe, with asquith, that the poem's 'bird of loudest lay' represents the composer william byrd and that the crow is the jesuit henry garnet.