April 21
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- 680 CE - Death of Mu'awiya b. Abi Sufyan (Rajab 15, 60)
- 1802 CE - Attack of Saudi king, Sa'ud b. 'Abd al-'Aziz, to Karbala and plundering of the whole city, destruction of the Shrine of al-Abbas (a) and looting all the gifted objects inside the shrine including chandeliers of gold and silver. (Dhu l-Hijja 18, 1216)
- 1802 CE - Martyrdom of 'Abd al-Samad al-Hamadani in the Wahhabis attack to Karbala (Dhu l-Hijja 18, 1216)
- 1903 CE - Birth of Rida Madani Kashani (Muharram 23, 1321)
- 1926 CE – The second Demolition of al-Baqi' (shrines of Shi'a Imams) by the Wahhabis took place in Yawm al-Hadm. (Shawwal 8, 1344 AH)
- 1998 CE - Martyrdom of Murtada Najafi Burujirdi (Dhu l-Hijja 23, 1418)