, Sebastião José de Carvalho e Melo, the talented son of a Lisbon squire, began a diplomatic career as the Portuguese Ambassador in London and later in Vienna. The Queen consort of Portugal, Archduchess Maria Anne Josefa of Austria, was fond of Melo; and after his first wife died, she arranged the widowed de Melo's second marriage to the daughter of the Austrian Field Marshal Leopold Josef, Count von Daun. King John V of Portugal, however, was not pleased and recalled Melo to Portugal in 1749. John V died the following year and his son, Joseph I of Portugal was crowned. In contrast to his father, Joseph I was fond of de Melo, and with the Queen Mother's approval, he appointed Melo as Minister of Foreign Affairs. As the King's confidence in de Melo increased, the King entrusted him with more control of the state. By 1755, Sebastião de Melo was made Prime Minister. Impressed by British economic success he had witnessed while Ambassador, he successfully implemented similar economic policies in Portugal. He abolished slavery in Portugal and in the Portuguese colonies in India; reorganized the army and the navy; restructured the University of Coimbra, and ended discrimination against different Christian sects in Portugal.
But Sebastião de Melo's greatest reforms were economic and financial, with the creation of several companies and guilds to regulate every commercial activity. He demarcated the region for production of Port to ensure the wine's quality, and this was the first attempt to control wine quality and production in Europe. He ruled with a strong hand by imposing strict law upon all classes of Portuguese society from the high nobility to the poorest working class, along with a widespread review of the country's tax system. These reforms gained him enemies in the upper classes, especially among the high nobility, who despised him as a social upstart.
Disaster fell upon Portugal in the morning of 1 November 1755, when Lisbon was struck by a
