 Luís de Vasconcelos e Sousa, 3rd Count of Castelo Melhor

Dom Luís de Vasconcelos e Sousa, 3rd Count of Castelo Melhor (1636 – 15 August 1720) was a Portuguese politician and prime minister.Portuguese royal favourite who, as effective governor of Portugal from 1662 to 1667 during the reign of Afonso VI, was responsible for the successful prosecution of the war against Spain, which led, in 1668, to Spanish recognition of Portugal's new ruling dynasty.