Reconquista: After a siege of four months, crusader knights conquer Lisbon.

Siege of Lisbon

A successful attack by Crusaders and Portugal on Moorish-held Lisbon

The siege of Lisbon, from 1 July to 25 October 1147, was the military action against the Almoravid dynasty that brought the city of Lisbon under the definitive control of the new Christian power, the Kingdom of Portugal.