Second Crusade

The Battle of Dorylaeum on 25 October 1147 was fought between forces under Conrad III of the Holy Roman Empire and Mesud I of the Sultanate of Rum during the Second Crusade. No further details of the engagement's outcome or consequences are recorded in the available sources.

The siege of Lisbon brought the city under definitive control of the Kingdom of Portugal, wresting it from the Almoravid dynasty after a siege lasting from 1 July to 25 October 1147. The operation was a foundational military achievement for the nascent Portuguese kingdom under Afonso I, consolidating Christian authority over one of the Iberian Peninsula's most strategically significant cities. Conducted during the period of the Second Crusade, the siege drew on a multinational force whose commanders included figures from England, Flanders, and the Low Countries alongside Portuguese leadership, reflecting the broader crusading context in which Iberian Reconquista objectives were aligned with wider Latin Christian military mobilization. The capture of Lisbon materially expanded the territorial base of the Kingdom of Portugal and represented a major reversal for Almoravid power in the western Iberian Peninsula.

The Siege of Damascus in July 1148 was a central episode of the Second Crusade, drawing together the principal Crusader commanders — including King Baldwin III, Holy Roman Emperor Conrad III, and King Louis VII of France — alongside forces under Everard des Barres, Raymond du Puy, Thierry of Flanders, and Frederick of Swabia. Arrayed against a Crusader force recorded at 50,000, the Burid defenders of Damascus were led by Mu'in ad-Din Unur, who called upon Saif ad-Din Ghazi I and Nur ad-Din Zangi for relief. The failure of the operation constituted the defining military and political setback of the Second Crusade, demonstrating the inability of the assembled Western and Levantine Crusader leadership to translate numerical strength into a decisive strategic gain. The involvement of Nur ad-Din Zangi on the opposing side underscored the growing consolidation of Muslim power in the region that the crusade had sought to check.