Gottfried Semper (; 29 November 1803 – 15 May 1879) was a German architect, art critic, and professor of architecture who designed and built the Semper Opera House in Dresden between 1838 and 1841. In 1849 he took part in the May Uprising in Dresden and was put on the government's wanted list. He fled first to Zürich and later to London. He returned to Germany after the 1862 amnesty granted to the revolutionaries. Semper wrote extensively on the origins of architecture, especially in his book The Four Elements of Architecture (1851), and was one of the major figures in the controversy surrounding the polychrome architectural style of ancient Greece. He designed works at all scales—from major urban interventions such as the redesign of the Ringstraße in Vienna, to a baton for Richard Wagner. His unrealised design for an opera house in Munich was, without permission, adapted by Wagner for the Bayreuth Festspielhaus. Life Early life (to 1834) Semper was born into a well-to-do industrialist family in Altona. The fifth of eight children, he attended the Gelehrtenschule des Johanneums in Hamburg before starting his university education at Göttingen in 1823, where he studied historiography and mathematics. He subsequently studied architecture in 1825 at the University of Munich under Friedrich von Gärtner. In 1826, Semper travelled to Paris in order to work for the architect Franz Christian Gau, and he was present when the July Revolution of 1830 broke out. Between 1830 and 1833 he travelled to Italy and Greece in order to study the architecture and designs of antiquity. In 1832, he participated for four months in archaeological research at the Acropolis in Athens. During this period he became very interested in the Biedermeier-inspired polychromy debate, which centered on the question whether buildings in Ancient Greece and Rome had been colorfully painted or not. The drawn reconstructions of the painterly decorations of ancient villas he created in Athens inspired his later designs for the painted decorations in Dresden and Vienna. His 1834 publication Vorläufige Bemerkungen über bemalte Architectur und Plastik bei den Alten (Preliminary Remarks on Polychrome Architecture and Sculpture in Antiquity), in which he took a strong position in favor of polychromy - supported by his investigation of pigments on the Trajan's column in Rome - brought him sudden recognition in architectural and aesthetic circles across Europe . Dresden period (1834–1849) On September 30, 1834, Semper obtained a post