Joaquim Lobo da Silveira, 7th Count of Oriola
Joaquim Lobo da Silveira, 7th Count of Oriola 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.
