The Alvor massacre took place in June 1189 during the Third Crusade, when a fleet of crusaders from the Holy Roman Empire, Denmark and the County of Flanders stormed the castle of Alvor in the Algarve, then part of the Almohad Caliphate, and massacred 5,600 people.[1] The place of the conquest and massacre of Alvor in the Portuguese Reconquista is unclear, but there are grounds for thinking that it was part of the strategy of King Sancho I, who launched a siege of Silves a month later.[2]