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Arbaeen, Shiʿi Muslim observance that marks the end of the 40-day mourning period for the death of al-Ḥusayn ibn ʿAlī, which is commemorated annually on Ashura. It is marked on the 20th day of the Islamic month of Safar, especially in the city of Karbala, Iraq, where Ḥusayn was buried after being killed in the Battle of Karbala (680). The Muslim use of a lunar calendar means that Ashura and Arbaeen may occur during any...