661 CE

Year 661 CE^[1] which is a common year in the Julian calendar started on Friday, Sha'ban 23, 40 AH, and ended on Friday, Ramadan 3, 41 AH^[2].

Events

January 26 – Imam Ali (a) was struck with a sword by Ibn Muljam al-Muradi in Kufa Mosque and martyred from its injury two days later. (Ramadan 19, 40 AH)
January 28 – More than forty thousand people gave allegiance to Imam al-Hasan (a) as the next caliph after Imam Ali (a).(Ramadan 21, 40 AH)
July 30 – The peace treaty between Imam al-Hasan (a) and Mu'awiya (Rabi' I 26, 41 AH)
November 22 – Attempts to assassinate Imam Hasan al-Mujtaba (a) in al-Mada'in, during the war with Mu'awiya b. Abi Sufyan (Rajab 23, 41 AH)

January 28 – Martyrdom of Imam Ali (a) two days after being struck in his morning prayer (Ramadan 21, 40 AH)
January 28 – Death of Ibn Muljam al-Muradi in retribution for Imam Ali's murder. (Ramadan 21, 40 AH)