Joaquim Lobo da Silveira, 7th Count of Oriola (1772-1846) was a Portuguese plenipotentiary at the Congress of Vienna in 1815.  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.
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)).
|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]"