The War of the Three Sanchos and the Legacy of Sancho the Great

During the 11th century, three grandsons of Sancho III "the Great" of Navarre, all named Sancho, rule over different Spanish kingdoms. These first cousins are:

• Sancho II "the Strong", King of Castile,
• Sancho IV Garcés, King of Navarre,
• Sancho Ramírez, King of Aragon.

Their rivalries and conflicts culminate in the War of the Three Sanchos, a struggle over territorial disputes and regional dominance.

The primary historical source documenting this war is the thirteenth-century Primera Crónica General, which provides a narrative of the events and reflects the fragmentation and power struggles among the Christian kingdoms of Iberia during the Reconquista.