Marquis of Fronteira

Count of Torre (in Portuguese "Conde da Torre") was a Portuguese title of nobility created by a royal decree, dated from July 26, 1638, by King Philip II of Portugal, and granted to "Dom" Fernando de Mascarenhas, Lord of Rosmaninhal.
The new title of Marquis of Fronteira (in Portuguese "Marquês de Fronteira") was granted by a royal decree of King Afonso VI of Portugal, issued on January 7, 1670, to his son Dom João de Mascarenhas, 2nd Count of Torre, to reward his participation in the Portuguese Restoration War.
Later, in the 18th century, the House of Fronteira inherited new honours and estates becoming one of the most powerful families in Portugal:
The current Marquis also represents the House of Távora, already extinct.
Bibliography.
”Nobreza de Portugal e do Brasil" – Vol. II, pages 623/628, and Vol. III pages 441/442. Published by Zairol Lda., Lisbon 1989.