Ksar-el-Kebir (Arabic, القصر الكبير) is a city in Morocco also known as Al Qasr al Kabir or Alcazarquivir (Spanish). The name means The big castle in English. The population of the city is 107,380 (2004 census).
The city is of historical significance as the site of the Battle of Alcazarquivir. On August 4, 1578, King Sebastião of Portugal suffered a crushing defeat at the hands of the Moors which ended Portugal's ambitions in the Maghreb. Both King Sebastião and Abd al-Malik, the ruler of Morocco died during the battle.
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