عبيد الله بن زياد
A hussainiya is different from a mosque. The name comes from Husayn ibn Ali, the third of the Twelve Imams and the grandson of the Islamic prophet Muhammad. Husayn was martered at the Battle of Karbala on 10 October 680 CE during the reign of Ubayd Allah ibn Ziyad. The Shia commemorate his martyrdom every year on Ashura, the 10th day of Muharram. There are also other ceremonies which are held during the year in hussainiyas, including religious commemorations unrelated to Ashura. and may not necessarily hold jumu'ah (Friday congregational prayer).