Karbala in the context of "Hawza Najaf"

Shia Islam is the second-largest branch of Islam. It holds that Muhammad designated Ali ibn Abi Talib (r. 656–661) as both his political successor (caliph) and as the spiritual leader of the Muslim community (imam). However, his right is understood to have been usurped by a number of Muhammad's companions at the meeting of Saqifa, during which they appointed Abu Bakr (r. 632–634) as caliph instead. As such, Sunni Muslims believe Abu Bakr, Umar (r. 634–644), Uthman (r. 644–656) and Ali to be 'rightly-guided caliphs', whereas Shia Muslims regard only Ali as the legitimate successor.

Shia Muslims believe that the imamate continued through Ali's sons, Hasan and Husayn, after which various Shia branches developed and recognized different imams. They revere the ahl al-bayt, the family of Muhammad, maintaining that they possess divine knowledge. Shia holy sites include the shrine of Ali in Najaf, the shrine of Husayn in Karbala, and other mausoleums of the ahl al-bayt. Later events, such as Husayn's martyrdom in the Battle of Karbala (680 CE), further influenced the development of Shia Islam, contributing to the formation of a distinct religious sect with its own rituals and shared collective memory.

Kufa (Arabic: الْكُوفَة "al-Kūfah"), also spelled Kufah, is a city in Iraq, about 170 kilometres (110 mi) south of Baghdad, and 10 kilometres (6.2 mi) northeast of Najaf. It is located on the banks of the Euphrates River. The estimated population in 2003 was 110,000.

Along with Samarra, Karbala, Kadhimiya and Najaf, Kufa is one of five Iraqi cities that are of great importance to Shi'ite Muslims. The city was founded in 638 CE (17 Hijrah) during the reign of the second Rashidun Caliph, Umar ibn Al-Khattab, and it was the final capital of the last Rashidun Caliph, Ali ibn Abi Talib. Kufa was also the founding capital of the Abbasid Caliphate. During the Islamic Golden Age it was home to the grammarians of Kufa. Kufic script is named for the city.

Muslims, including Shia, Sunni, Ibadi and other branches, agree on two holiest sites in Islam being the Masjid al-Haram (including the Kaaba) in Mecca; the Masjid an-Nabawi in Medina.

Sites associated with the Islamic prophet Muhammad, his daughter Fatima and son-in-law Ali, the respective Shia Imams descended from them and their family members (collectively referred to as Ahl al-Bayt) are considered holy by the different Shia Muslim sects. Karbala and Najaf in Iraq are two of holiest cities revered by all Shia sects. Additionally, Mashhad and Qom in Iran are two of the holiest cities to Twelver Shia, the largest Shia sect.

The Imam al Husayn Shrine (Arabic: مَقَام الإِمَامُ الْحُسَيْن اِبِنْ عَلي, romanized: Maqām al-ʾImām al-Ḥusayn ʾibn ʿAlī) is the mausoleum of Husayn ibn Ali and Shi'ite mosque, located in the holy city of Karbala, in the Karbala Governorate of Iraq. Husayn was a grandson of Muhammad, and the site is near the place where he embraced martyrdom during the Battle of Karbala in 680 CE. The tomb of Husayn is one of the holiest sites in Shia Islam, outside of Mecca and Medina, and many make pilgrimages to the site. Every year, millions of pilgrims visit the city to observe Ashura, which marks the commemoration of Husayn's death for all Muslims.