*Liga Patriotica do Norte* is a political treatise by the outstanding Portuguese writer and activist Antero de Quental. The book was published in 1871 at a time of political turbulence in Portugal and Spanish rule. In his work, the author expresses his support for the League of Patriots, which opposed the imperialist policy of Portugal. Antero de Quental carefully analyzes the political situation and calls for unity and devotion to his people. *Liga Patriotica do Norte* is an important book that helps to understand the historical events and deep convictions of its author.