When it was built, still in the 17th century, the building was thought of as a holiday home for D. João de Mascarenhas, 2nd Count of Torre and 1st Marquis of Fronteira. The story of the Marquis de Fronteira, hero of the War for the Restoration of Independence, fought against Spain in 1640, is present in the beautiful tiles on the walls of the palace, such as that of the Battle Room. Outside, to highlight the garden of Venus and the formal garden of the 17th century, where the Gallery of Kings is located. Being an inhabited House-Museum that remains in private possession, all visits are guided. The Casas de Fronteira and Alorna Foundation ensures a regular cultural program, embracing scientific and educational initiatives.