Joaquim Lobo da Silveira, 7th Count of Oriola (May 12, 1772 – April 27, 1846) was a Portuguese plenipotentiary at the Congress of Vienna in 1815.^[1][2] While at the Congress he signed a number of treaties and documents on behalf of Prince-Regent John of Portugal including the Declaration of the Powers, on the Abolition of the Slave Trade, on 8 February 1815.^[2]

Later he acquired land in Prussia and settled there becoming a naturalised citizen of Prussia. The King of Prussia granted him the title of graf (the German equivalent to his Portuguese title of conde (count)).^[1]

• (in Portuguese) Bonifácio, Maria de Fátima (2011), Memórias do Duque de Palmela, Leya, p. 114 footnote 119, ISBN 9789722045056
• Hansard, T.C (1 February – 6 March 1816), The Parliamentary Debates from the Year 1803 to the Present Time …, vol. 32, T.C. Hansard, pp. 200–201

• Jacob van der Merck (c.1610 - 1664), The Weiss Gallery, 2012, archived from the original on 2013-02-09, retrieved 24 December 2012 {{citation}}: External link in |publisher= (help) "His Portuguese grandfather, Joaquin Jose Lobo da Silveira (1772 – 1846)... [whose] son was Eduardo Ernesto Lobo da Silveira, Graf von Oriola (1809 – 1862) [de]"