The Siege of Lisbon took place in 1147 during the Reconquista, a period when Christian kingdoms sought to reclaim territory from Muslim rule in the Iberian Peninsula. The siege was part of a larger campaign led by the forces of Afonso I of Portugal, who aimed to capture the city from the Almoravid dynasty. The siege lasted several months and involved a coalition of Portuguese and Northern European crusaders. The successful capture of Lisbon marked a significant victory for the Christian forces and helped establish Portugal as an independent kingdom. This event also contributed to the spread of Christianity in the region and solidified Afonso I's reputation as a key figure in the Reconquista.