Bermudo II’s Usurpation and Conflict with Almanzor (984–987 CE)

In 984 CE, Bermudo II, with military support from Navarre and the powerful Almanzor, usurps the throne of León from Ramiro III, plunging the kingdom into civil war. His rise to power further destabilizes León, already weakened by previous Muslim invasions and internal strife.

Break with Córdoba and Almanzor’s Retaliation (987 CE)

After securing his throne, Bermudo II expels Cordoban mercenaries from León in 987 CE, breaking his alliance with Almanzor. This act provokes a swift and decisive response from the ruler of Al-Andalus, who assembles a large invasion force to punish León and assert Muslim dominance over the northern Christian realms.

This conflict will culminate in devastating raids on Leónese territory, as Almanzor intensifies his military campaigns against the Christian north.