July 25

306 – Constantine I is proclaimed Roman emperor by his troops. 315 – The Arch of Constantine is completed near the Colosseum in Rome to commemorate Constantine I's victory over Maxentius at the Milvian Bridge. 677 – Climax of the Siege of Thessalonica by the Slavs in a three-day assault on the city walls. 864 – The Edict of Pistres of Charles the Bald orders defensive measures against the Vikings. 918 – Wang Geon becomes King of Goryeo after overthrowing Gung Ye in a coup the previous day 1137 – Eleanor of Aquitaine marries Prince Louis, later King Louis VII of France, at the Cathedral of Saint-André in Bordeaux. 1139 – Battle of Ourique: The Almoravids, led by Ali ibn Yusuf, are defeated by Prince Afonso Henriques who is proclaimed King of Portugal. 1261 – The city of Constantinople is recaptured by Nicaean forces under the command of Alexios Strategopoulos, re-establishing the Byzantine Empire. 1278 – The naval Battle of Algeciras takes place in the context of the Spanish Reconquista resulting in a victory for the Emirate of Granada and the Maranid Dynasty over the Kingdom of Castile. 1467 – The Battle of Molinella: The first battle in Italy in which firearms are used extensively. 1536 – Sebastián de Belalcázar on his search of El Dorado founds the city of Santiago de Cali. 1538 – The city of Guayaquil is founded by the Spanish Conquistador Francisco de Orellana and given the name Muy Noble y Muy Leal Ciudad de Santiago de Guayaquil. 1547 – Henry II of France is crowned. 1554 – The royal wedding of Mary I and Philip II of Spain celebrated at Winchester Cathedral. 1567 – Don Diego de Losada founds the city of Santiago de Leon de Caracas, modern-day Caracas, the capital city of Venezuela. 1591 – The Duke of Parma is defeated near the Dutch city of Nijmegen by an Anglo-Dutch force led by Maurice of Orange. 1593 – Henry IV of France publicly converts from Protestantism to Roman Catholicism. 1603 – James VI and I and Anne of Denmark are crowned in Westminster Abbey.