Philip of Saint-Pol vs Sancho II of Castile

Philip of Saint-Pol inherited the Duchy of Brabant upon the death of his brother John IV. His rule marked the last independent reign of a Burgundian duke in Brabant before it was fully integrated into the Burgundian state.

Philip of Saint-Pol signed the Treaty of Delft with Jacqueline of Hainaut, ending the war over the succession in Hainaut and Holland. The treaty recognized Philip's authority over these territories, expanding Burgundian control.

Philip of Saint-Pol died without legitimate children, leading to the Duchy of Brabant passing to his cousin Philip the Good, Duke of Burgundy. This ended the independent line of Burgundian dukes in Brabant and fully integrated the duchy into the Burgundian state.

Sancho II conquered the Kingdom of Leon from his brother Alfonso VI, following the division of their father Ferdinand I's realm. He defeated Alfonso at the Battle of Llantada and forced him into exile in Toledo. This conquest united Leon and Castile under Sancho's rule.

Sancho II conquered the Kingdom of Galicia from his brother Garcia II, who was captured and imprisoned. This conquest completed Sancho's unification of the realms of his father, making him the most powerful Christian ruler in Iberia.

Sancho II besieged the city of Zamora, held by his sister Urraca, who had rebelled against him. During the siege, Sancho was assassinated by a Zamoran noble named Vellido Dolfos. His death ended his unification efforts and allowed his brother Alfonso VI to reclaim the throne.