BEIRUT (AP) — Shiite Muslims around the world on Thursday marked Ashoura, a holy day symbolizing sacrifice and martyrdom that holds special significance for many this year after months of war in Iran and Lebanon.Ashoura commemorates the martyrdom of Imam Hussein, grandson of the Prophet Muhammad, at the Battle of Karbala in 680 A.D. Imam Hussein was killed with his family and companions after refusing to pledge allegiance to the Umayyad caliphate.The event cemented the schism between Sunni and Shiite Islam and remains a powerful symbol of resistance against oppression and injustice.This year, Ashoura comes after months of war in Iran and Lebanon, homes to two of the world’s largest Shiite populations. Iran and the U.S. this week launched talks aimed at finalizing a fragile ceasefire agreement.On the first day of the war on Feb. 28, Iran’s supreme leader, Ayatollah Ali Khamenei, was killed in an Israeli airstrike. The 86-year-old Khamenei was not just Iran’s top political leader. He also had a final say on all religious matters and was revered by millions of Shiites worldwide. Ashoura comes just days before his funeral procession.

The war also spilled over into Lebanon, where Iran’s key ally, the Hezbollah militant group, has been battling Israeli troops for months.