This is why so many buildings of the early English Neo-Renaissance style often have more of a "castle air" than their European contemporaries, which can add again to the confusion with the Gothic revival style. When the revival of Renaissance style architecture came "en vogue" in the mid 19th century, it often materialized not just in its original form first seen in Italy, but as a hybrid of all its forms according to the whims of architects and patrons, an approach typical of the mid and late 19th century. Modern scholarship defines the styles following the Renaissance as Mannerist and Baroque, two very different, even opposing styles of architecture, but the architects of the mid 19th century understood them as part of a continuum, often simply called 'Italian', and freely combined them all, as well as Renaissance as it was first practiced in other countries. Thus Italian, French and Flemish Renaissance coupled with the amount of borrowing from these later periods can cause great difficulty and argument in correctly identifying various forms of 19th-century architecture. Differentiating some forms of French Neo-Renaissance buildings from those of the Gothic revival can at times be especially tricky, as both styles were simultaneously popular during the 19th century. As a consequence, a self-consciously "Neo-Renaissance" manner first began to appear circa 1840. By 1890 this movement was already in decline. The Hague's Peace Palace completed in 1913, in a heavy French Neo-Renaissance manner was one of the last notable buildings in this style. Charles Barry introduced the Neo-Renaissance to England with his design of the Travellers Club, Pall Mall (1829–1832). Other early but typical, domestic examples of the Neo-Renaissance include Mentmore Towers and the Château de Ferrières, both designed in the 1850s by Joseph Paxton for members of the Rothschild banking family. The style is characterized by original Renaissance motifs, taken from such Quattrocento architects as Alberti. These motifs included rusticated masonry and quoins, windows framed by architraves and doors crowned by pediments and entablatures. If a building were of several floors, the uppermost floor usually had small square windows representing the minor mezzanine floor of the original Renaissance designs. However, the Neo-renaissance style later came to incorporate Romanesque and Baroque features not found in the original Renaissance architecture which was often more severe in its design.