The Battle of Alfarrobeira was a crucial military engagement fought in Portugal during the mid-15th century, rooted in the complex dynamics of power among the nobility. The conflict emerged from the political rivalry between the House of Braganza, led by Afonso, and the supporters of the ruling House of Aviz. This struggle for dominance was exacerbated by the weak state of the Portuguese crown and ongoing disputes over royal succession, setting the stage for a decisive confrontation. The forces of Afonso gathered a substantial army, capitalizing on the discontent that lingered among factions loyal to the House of Aviz. The battle took place near the town of Alfarrobeira, as both sides aimed to decisively settle their political grudges through combat.

In the heat of battle, tactical maneuvers and the resolve of Afonso's troops played a critical role in overcoming the opposition. After several hours of fierce fighting, the House of Braganza emerged victorious, significantly weakening the influence of the Aviz faction. This victory was pivotal, as it not only secured Afonso’s position but also allowed the House of Braganza to ascend as a prominent royal lineage within Portugal, shaping the future political landscape of the nation. The aftermath of the battle led to the decline of the supporters of the House of Aviz and paved the way for a new era in the Portuguese monarchy, where the Braganza family would become a central figure in the royal lineage for generations to come.