António de Saldanha da Gama, Count of Porto Santo
António de Saldanha da Gama, Count of Porto Santo (1778–1839) 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.
- Hansard, T.C (1 February to 6 March 1816), The Parliamentary Debates from the Year 1803 to the Present Time …, 32, T.C. Hansard, pp. 200–201 Check date values in:
- Hogg, Peter C. (1973), The African Slave Trade and Its Suppression: A Classified and Annotated Bibliography of Books, Pamphlets and Periodical Articles, Cass Library of African Studies, 137, Routledge, p. 380, ISBN 9780714627755
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