Afonso of Lencastre was a Portuguese

Portugal

Portugal , officially the Portuguese Republic is a country situated in southwestern Europe on the Iberian Peninsula. Portugal is the westernmost country of Europe, and is bordered by the Atlantic Ocean to the West and South and by Spain to the North and East. The Atlantic archipelagos of the...

 nobleman, son of the 3rd Dukes of Aveiro

Duke of Aveiro

The Royal Dukedom of Aveiro was an aristocratic Portuguese title, granted in 1535 by King John III of Portugal to his 4th cousin, John of Lencastre, son of Infante George of Lencastre, a natural son of King John II of Portugal....

, Álvaro

Álvaro of Lencastre, 3rd Duke of Aveiro

Álvaro of Lencastre was the son of Afonso of Lencastre, second son of infante George of Lencastre, 2nd Duke of Coimbra.- Disputed Inheritance :...

 and Juliana of Lencastre. This family descended from the Infante George of Lencastre

George, Duke of Coimbra

Jorge de Lencastre was a Portuguese Prince, illegitimate son of King John II of Portugal and Ana de Mendonça, a maid of Joanna la Beltraneja. He became the second Duke of Coimbra in 1509...

, therefore they had royal blood.

By a royal decree dated from 8 April 1627, King Philip III of Portugal

Philip IV of Spain

Philip IV was King of Spain between 1621 and 1665, sovereign of the Spanish Netherlands, and King of Portugal until 1640...

 (aka Philip IV of Spain) granted him the new title of Marquis of Porto Seguro

Marquis of Porto Seguro

Marquis of Porto Seguro was a Portuguese title of nobility created by a royal decree of king Philip III of Portugal dated from 8 April, 1627, and granted to D...

.

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 in 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

Azeitão

Azeitão is a region near Setúbal composed by a cluster of small "aldeias" or small villages, some of those are: Vila Fresca de Azeitão, Vila Nogueira de Azeitão,Brejos de Azeitão, Aldeia de Irmãos, Vendas de Azeitão....

 (near Setúbal

Setúbal

Setúbal is the main city in Setúbal Municipality in Portugal with a total area of 172.0 km² and a total population of 118,696 inhabitants in the municipality. The city proper has 89,303 inhabitants....

), Portugal, and, in 15 July 1627, he married a Spanish

Spain

Spain , officially the Kingdom of Spain languages]] under the European Charter for Regional or Minority Languages. In each of these, Spain's official name is as follows:;;;;;;), is a country and member state of the European Union located in southwestern Europe on the Iberian Peninsula...

 lady, Ana de Sande de Padilla, 2nd Marchioness of Valdefuentes. They had 4 children:

1. Alvaro (1630- ? ), died in childhood;
2. Luís, died in childhood;
3. Agustin de Lencastre Padilla y Bobadilla (1639-1720), Duke of Abrantes. Married to Joana de Noronha de Silva (c.1640-1690). They had issue.
4. Maria (1639-1692), married in 1654 to the Spanish Pedro de Leiva-Lacerda, Marquis de Landrada.