St. Paul's is a post-Reformation cathedral, built on a pre-Reformation plan; designed for Anglicans, re-planned for Evangelicals, and then re-decorated for Anglo-Catholics. Hence the complexity of its architectural history. This article examines Wren's unfinished legacy, and discusses the many schemes to complete the cathedral's decoration, beginning with Sir James Thornhill and ending with Sir William Richmond. Central to its theme are the decorative proposals produced between 1870 and 1874 by William Burges (1827–81). Public outcry prevented the implementation of Burges's plans for a full-scale programme of marble and mosaic decoration. Nevertheless, his schemes formed the basis of the cathedral's eventual refurbishment during the 1890s.