The book "Foundation of the Portuguese Monarchy: An Anti-Iberian Essay" was written by the Portuguese historian and writer Antonio Augusto Teixeira de Vasconcelos. In his work, the author refers to an important stage in the history of Portugal - the formation of the monarchy. He reveals the theme of the establishment of the monarchy from an anti-Iberian perspective, pointing out the negative influence of Spain on the development of Portugal. The book is a valuable source for understanding the political and cultural processes in Portugal and its relations with Spain in the Middle Ages and the early modern period.