"Ultimatum de 11 de Janeiro" is a political and journalistic treatise by the famous Portuguese writer and activist Antero de Quental. In this book, the author expresses his views on the current state of Ukrainian society, the moral madness of the elite and the need for reforms. The January 11 ultimatum was one of the symbols of national protest and resistance against totalitarianism. Reading this book, the reader will learn the thoughts of a great thinker about the need for moral revival of the nation and changes in society.