The capture of Lisbon happened in 1094 when the Almoravids, led by Syr ibn Abi Bakr, invaded and captured Lisbon from the Castilians, defeating its ruler, Count Raymond.
During the winter of 1092-1093, the last ruler of Taifa of Badajoz, Al-Mutawwakil, made an alliance with Alfonso VI of León and Castile for help against the approaching Almoravids.
In the winter of 1093-1094, the Almoravids general, Sir Ibn Abi Bakr, sent a campaign to remove Al-Mutawwakil from his power.
Count Raymond attempted to advance; however, he was surprised and suffered a major defeat.
After this, the Almoravids assaulted Lisbon fiercely, killing and capturing the majority of the Castilian garrison.