Portuguese monarchy and the territorial integrity of the nation. At the start of the chronicle, Rui de Pina outlines the circumstances of D. Affonso's ascension to the throne following the death of his brother, King D. Sancho. Affonso, initially titled as the Count of Boulogne, is depicted as a ruler of commendable virtues who reformed policies, improved governance, and undertook military endeavors, notably concerning the Algarve region. The opening chapters discuss his marriages—first to the Countess of Boulogne and later to the daughter of the King of Castile—highlighting the political significance of these unions and how they influenced his rule and the dynamics of power during his reign. (This is an automatically generated summary.)