This approval of slavery was reaffirmed and extended in the Romanus Pontifex bull of 1455 (also by Nicholas V).
Perhaps the most famous work kept in the museum are the Saint Vincent Panels, which date from before 1470 and are attributed to Nuno Gonçalves, court painter of King Afonso V.
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In 1455, the Villa of Monforte entered in the ownership of the territorial domain of Bragança's House, through the donation done by D. Afonso V to the count of Arraiolos.