1850 Adelaide of Löwenstein-Wertheim-Rosenberg, Queen of Portugal by J. J. Pereira
All of those small German noble and royal houses provided an ample supply of titled spouses for everybody's needs. Löwenstein-Wertheim is a county dating to Holy Roman Empire times. The district is in modern Baden-Württemberg.
From Biblioteca Digital Nacional de Portugal; it can be found here. Sepia tone removed by gogm.