nsar Bait al-Maqdis (Ansar Bayt al-Maqdis, "Supporters of the Holy House"), or Ansar Jerusalem ("Supporters of Jerusalem") is the name of a seemingly fractured Sunni jihadist group, with many Sinai based members now having sworn allegiance to the Islamic State of Iraq and the Levant, and with members of the organization in the Nile Valley of Egypt remaining loyal to al-Qaeda.
Ansar Bait al-Maqdis emerged as an extremist militant group after the Egyptian revolution in 2011, with its operations increasing in the wake of the Egyptian Revolution of 2013 and the overthrow of Mohammed Morsi.
The group is believed to have been the main group behind the militant activity in the Sinai. The group recruits Bedouins as well as other Egyptians and people of other nationalities. Ten leaders from the group were reported to have escaped from the Sinai to Gaza and Marsa Matrouh in late 2013.
On 10 November 2014, many members of the group took an oath of allegiance to Abu Bakr al-Baghdadi, the leader of the Islamic State of Iraq and the Levant. ISIL supporters from the group describe themselves as Wilayah Sinai, or the Province of Sinai. A faction of the Provice of Sinai branch also operates in the Gaza Strip, which has renamed itself to the Islamic State in Gaza.