The Islamic State of Iraq (ISI; Arabic: دولة العراق الإسلامية Dawlat al-ʿIrāq al-ʾIslāmiyyah) was a Salafi jihadist militant organization that fought the forces of the U.S.-led coalition during the Iraqi insurgency. The organization aimed to overthrow the Iraqi federal government and establish an Islamic state governed by Sharia law in Iraq.
Islamic State of Iraq traces its origins to Jama'at al-Tawhid wal-Jihad (JTJ) group, which was formed by the Jordanian national Abu Musab al-Zarqawi in Jordan in 1999. Al-Zarqawi led the group, until his death in June 2006. Jama'at fought the American occupation forces during the early Iraqi insurgency following the 2003 invasion of Iraq, and on 17 October 2004 al-Zarqawi had pledged allegiance to Osama bin Laden's al-Qaeda network; and the group became known as "Tanzim Qaidat al-Jihad fi Bilad al-Rafidayn" (commonly known as al-Qaeda in Iraq). In January 2006, AQI and seven other Sunni guerrilla groups formed the Mujahideen Shura Council (MSC), which on 15 October 2006 disbanded to form the "Islamic State of Iraq" organization, led by Abu Omar al-Baghdadi as its first Emir. Announcing the dissolution of both AQI and the MSC, al-Baghdadi declared that the previous organizations have been replaced by ISI.