Abū al-Sābigha Shamir ibn Dhī al-Jawshan (Arabic: أبو السابغة شمر بن ذي الجوشن), often known as Shamir or Shimar, was an Arab military commander from Kufa who killed Husayn ibn Ali, the grandson of the Islamic prophet Muhammad, at the Battle of Karbala in 680.
Shimr, along with various other tribal notables, aided the governor Ubayd Allah ibn Ziyad in quelling the rebellion.
Shimr was subsequently sent to Karbala with orders to either force Husayn into submission or to kill him in case of refusal.
On the battle day (10 October), Shimr commanded the left wing of the Umayyad army.
He then attempted to kill Husayn's surviving son Zayn al-Abidin, but was prevented by Ibn Sa'd.
Mus'ab ibn al-Zubayr ruled Basra at the time and Shimr wrote him a letter requesting assistance.
[10] Shimr is depicted usually wearing red with a long feathered cap in the passion plays during the Shia mourning remembrance of Ashura.