Johann Bernhard Fischer von Erlach (20 July 1656 - 5 April 1723) was probably the most influential Austrian architect of the Baroque period.
Architectural tastes throughout the Habsburg Empire were profoundly influenced by his ideas, as articulated in A Plan of Civil and Historical Architecture (1721), one of the first and most popular comparative studies of world architecture.
Back in Austria in 1687, Fischer von Erlach was installed as a fashionable and sought-after architect. Commissions were plentiful, as royalty and highest echelons of aristocracy sought to repair damage inflicted on their country residences by the Ottoman Turks in the course of their 1683 campaign. Fischer's understanding of an urbane Baroque idiom appeared superior to that prevalent in Central Europe, and in 1687 he secured the key position of court architect, which he would retain in the service of three emperors.
In his 17th-century designs and commissions, Fischer von Erlach embraced Berniniesque powerful curving lines, seeking to convey a sense of movement. His other inspirations included Mansart's country residences and the Palladian classical villas, which he would study during his journeys to Prussia, the Netherlands, England in 1704 and Venice in 1707.
Thus Fischer presided over the genesis and early evolution of a distinctive brand of Baroque architecture, which would shape architectural tastes of the Austrian aristocracy for decades to come. His emblematic design from the 1690s was the Winter Palace of Prince Eugene of Savoy, commenced in 1695 in Vienna. As Hans Aurenhammer put it, this edifice represented "a new type of town palace characterized by impressive form, structural clarity, and the dynamic tension of its decoration".
After Joseph I's death in 1711, Fischer von Erlach was rarely entrusted with new commissions, as the more pleasing and less demanding designs of his rival Johann Lucas von Hildebrandt proved more popular with the young monarch Charles VI, Holy Roman Emperor and his court. He found an opportunity to draw some of the finest architectural reconstructions of the buildings of Antiquity, which were published in his groundbreaking Plan of Civil and Historical Architecture in 1721. He was also made responsible for various administrative tasks, which would take a large portion of his energy and time.
Clam-Gallas Palace in Prague, commenced in 1713, was one of his last designs for a stately town residence. The structure, much imitated by later architects, highlights Fischer's enthusiasm for Palladian facades, which became ever more pronounced during the last period of his work.
But it is Karlskirche in Vienna, started in 1715, that most fully illustrates his late synthetic style. In this structure, completed by his son Joseph Emanuel, Fischer's ambition was to harmonize the principal elements and ideas that underlie the most significant churches in the history of Western architecture: the Temple of Solomon in Jerusalem, Hagia Sophia in Constantinople, the Pantheon and Saint Peter's Basilica in Rome, the Dome des Invalides in Paris and Saint Paul's Cathedral in London.