of the two countries and forcing the Song dynasty to renounce all claims to its former territories north of the Huai River. The treaty reduces the Southern Song into a quasi-tributary state of the Jurchen Jin dynasty. 1143: Afonso Henriques is proclaimed King of Portugal by the cortes. 1143: The Treaty of Zamora recognizes Portuguese independence from the Kingdom of León. Portugal also recognizes the suzerainty of the pope. 1144: On December 24, Edessa falls to the Atabeg Zengi. 1145–1148: The Second Crusade is launched in response to the fall of the County of Edessa. 1147: On October 25, the four-month-long Siege of Lisbon successfully brings the city under definitive Portuguese control, expelling the Moorish overlords. 1147: A new Berber dynasty, the Almohads, led by Emir Abd al-Mu'min, takes North Africa from the Almoravides and soon invades the Iberian Peninsula. The Almohads began as a religious movement to rid Islam of impurities. 1147: The Wendish Crusade against the Polabian Slavs (or "Wends") in what is now northern and eastern Germany. 1150s 1150: Ramon Berenguer IV, Count of Barcelona marries Petronilla, the Queen of Aragon. 1151: The Treaty of Tudilén is signed by Alfonso VII of León and Raymond Berengar IV, Count of Barcelona, recognising the Aragonese conquests south of the Júcar and the right to expand in and annex the Kingdom of Murcia. 1153: The Treaty of Wallingford, ends the civil war between Empress Matilda and her cousin King Stephen of England fought over the English crown. Stephen acknowledges Matilda's son Henry of Anjou as heir. 1153: The First Treaty of Constance is signed between Emperor Frederick I and Pope Eugene III, by the terms of which, the emperor is to prevent any action by Manuel I Comnenus to reestablish the Byzantine Empire on Italian soil and to assist the pope against his enemies in revolt in Rome. 1154: the Moroccan-born Muslim geographer Muhammad al-Idrisi publishes his Geography. 1154: On December 27, Henry II is crowned King of England at Westminster Abbey. 1155: Pope Adrian IV grants overlordship of Ireland to Henry II of England in the bull Laudabiliter. 1156: On June 18, the Treaty of Benevento is entered into by Pope Adrian IV and the Norman Kingdom of Sicily. After years of turbulent relations, the popes finally settles down to a peace with the Hauteville kings. The kingship of William I is recognised over all Sicily, Apulia, Calabria, Campania,