The book "Luís de Vasconcelos e Sousa, 3rd Count of Castelo Melhor" offers a comprehensive analysis of the life and political career of a significant Portuguese politician and Prime Minister of the 17th century. Dom Luís de Vasconcelos e Sousa, who lived from 1636 to 1720, played a crucial role in the history of Portugal, particularly during the reign of King Afonso VI. As an effective governor from 1662 to 1667, he was instrumental in the successful military campaigns against Spain that led to the recognition of Portugal's independence in 1668. The book not only highlights his political strategies and power plays at court but also the complex relationships he maintained with the king and other influential figures. It is a valuable resource for anyone interested in the history of Portugal and the political structures of the 17th century.