Baron Diego Lopes Pereira d'Aguilar (born 1699 Portugal; died 10 August 1759, London) was a Portuguese-born London-based Jewish businessman, community leader and philanthropist, originally a Portuguese converso, who lived in the 18th century. He was created a baron of the Holy Roman Empire by Empress Maria Theresa of Austria. Biography In 1722 he went from Lisbon to London, and then to Vienna. From 1725 to 1747 he held the tobacco monopoly in Austria, and had the power to establish factories and regulate prices. When in 1747 he asked the government to return to him a part of the money that he had deposited on account of the revenues, the empress Maria Theresa replied: "This appears to me just. I owe him much more; therefore, return it to him." D'Aguilar was a great favorite with the empress, who commissioned him to rebuild and enlarge the imperial palace at Schönbrunn, and he advanced 300,000 florins for the work. In recognition of his services Maria Theresa made him a baron and privy councillor to the crown of the (Austrian) Netherlands and Italy. He was a Baron of the Holy Roman Empire. D'Aguilar, who together with his family enjoyed the greatest freedom of belief, was the founder of the Spanish or Turco-Jewish community in Vienna, and succeeded in obtaining many concessions for the relief of his oppressed fellow worshippers. As a result of his efforts the Jews of Moravia were protected from pillage in 1742, and the intention of Maria Theresa to expel the Jews from the whole of the Austrian empire, in 1748 or 1749, was abandoned. He left Vienna suddenly in 1749, because the Spanish government demanded his extradition. He went to London. Before leaving Vienna he presented the community which he had founded, as well as the Spanish-Jewish community of Temesvar, with beautiful silver crowns for the scrolls of the Law, upon which his name was inscribed. On the Day of Atonement a prayer was said for the repose of his soul by the Turco-Jewish community of Vienna. He matriculated his arms: Gules an eagle Or beneath a plate, on a chief Argent three hillocks Vert on each a pear Or slipped Vert. The crest is a demi-lion proper, wearing a castellation Azure on its head and holding a sprig of leaves Vert in its right paw. Personal life He married, 1722, Donna Simha da Fonseca (died 1755) and had issue