Through a letter issued on 30 October 1471, king Afonso V of Portugal granted him the Lordship of Montemor-o-Novo and on 25 April 1473, he was appointed the 7th Constable of Portugal, as was his great-grandfather, Nuno Álvares Pereira. Later, in 1478, the same king granted him the title of Marquis of Montemor-o-Novo – he was the first and sole marquis of this title.
When king John II of Portugal succeeded to the Portuguese throne and started actively his policy against the high nobility power (namely the Braganza and the Viseu families) João soon became one of the king's targets. He escaped to Castile but in Portugal he was condemned for treason, and his statue was symbolically executed in Abrantes, on 12 September 1483.
He died in Seville, on 30 April 1484, where he was buried, together with his wife, in the Santa Paula Monastery.
Generations indicate descent from Afonso, Duke of Braganza, founder of the House of Braganza, until João II, Duke of Braganza, the first Braganza monarch of Portugal; italics indicate a head of the House
Generations indicate descent from John IV, King of Portugal, formerly John II, Duke of Braganza, the first Braganza monarch of Portugal, until Manuel II, King of Portugal, the last monarch of Portugal, excluding the Miguelist line; italics indicate a head of the House
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