In spite of the Portuguese revolution of 1 December 1640, Afonso remained faithful to the Spanish Habsburgs.

To reward his fidelity, King Philip IV granted him, by a decree issued on 23 March 1642, the new titles of Duke of Abrantes and Marquis of Sardoal.

However, as Philip IV was no longer King of Portugal, these two titles were never recognise by the Portuguese authorities.

D. Afonso was born in his family palace, in Azeitão (near Setúbal), Portugal, and, on 15 July 1627, he married a Spanish lady, Ana de Sande de Padilla, 2nd Marchioness of Valdefuentes.

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