Napoleon III style
The Napoleon III style was a highly eclectic style of architecture and decorative arts, which used elements of many different historical styles,and also made innovative use of modern materials, such as iron frameworks and glass skylights. It flourished during the reign of Emperor Napoleon III in France (1852–1871) and had an important influence on architecture and decoration in the rest of Europe and the United States. Major examples of the style include the Opéra Garnier in Paris by Charles Garnier (1862–71), the Bibliothèque nationale de France. and the Church of Saint Augustine (1860–1871). The architectural style was closely connected with Haussmann's renovation of Paris carried out during the Second Empire; the new buildings, such as the opera, were intended as the focal points of the new boulevards.
Northern Mannerism
The three main centres of the style were in France, especially in the period 1530–50, in Prague from 1576, and in the Netherlands from the 1580s—the first two phases very much led by royal patronage. In the last 15 years of the century, the style, by then becoming outdated in Italy, was widespread across northern Europe, spread in large part through prints. In painting, it tended to recede rapidly in the new century, under the new influence of Caravaggio and the early Baroque, but in architecture and the decorative arts, its influence was more sustained.