On October 15, 2012,[1] a preliminary agreement was signed by the Government of the Philippines' chief negotiator Marvic Leonen, MILF Peace Panel Chair Mohagher Iqbal and Malaysian facilitator Tengku Dato' Ab Ghafar Tengku Mohamed along with President Aquino, Prime Minister Najib Razak of Malaysia, MILF chairman Al-Hajj Murad Ebrahim and Secretary-General Ekmeleddin İhsanoğlu of the Organisation of Islamic Cooperation at Malacañang Palace in Manila.

On September 9, 2024, the Supreme Court of the Philippines upheld the validity of the Bangsamoro Organic Law, but declared unconstitutional the provision that considered the provinces of the former Autonomous Region in Muslim Mindanao to be one unit for purposes of determining ratification.

Because majority of the voters of the province of Sulu rejected the ratification of the law in the 2019 Bangsamoro autonomy plebiscite, it was declared to be not part of the BARMM.

[8] The Autonomous Region in Muslim Mindanao (ARMM) was proposed in 1976 during the Ferdinand Marcos administration and created on August 1, 1989, through Republic Act No.

He proposed an autonomous region named Bangsamoro to replace ARMM with the agreement between the government and Moro Islamic Liberation Front.

Of these areas, only four provinces (Lanao del Sur, Maguindanao, Sulu and Tawi-Tawi) voted in favor of inclusion in the new autonomous region.

The Autonomous Region in Muslim Mindanao (ARMM) ceased to exist after a two-part 2019 plebiscite that ratified the Bangsamoro Organic Law (BOL).