Establishment The name
Aleosan is an acronym derived from the three municipalities of
Iloilo where the majority of the early Christian inhabitants in northern
Pikit, its mother municipality, came from:
Alimodian,
Leon, and
San Miguel.
Then assemblyman Jesus P. Amparo authored
Parliamentary Bill No. 670, which was also co-authored by assemblymen Blah T. Sinsuat, Ernesto F. Roldan and Tomas B. Baga Jr. The bill sought the establishment of the new municipality which was originally proposed as
O. Romualdez. A plebiscite for ratification, along with ten more newly created
local entities, was held on May 17, coinciding with
the barangay elections.
Partial inclusion to the Bangsamoro In 2019, Dunguan and Tapodoc were among the 63
barangays in
the province which became part of the
Special Geographic Area of the newly created
Bangsamoro, after having the affirmative vote won to join
the autonomous region in
a plebiscite held on February 6. The two, with Lower Mingading, were among the 39
barangays in the province that unsuccessfully voted
for the inclusion in the
Autonomous Region in Muslim Mindanao in 2001; with Pagangan, were proposed to be part of the Bangsamoro, which replaced ARMM by virtue of
Republic Act No. 11054. In 2023, the
Bangsamoro Parliament approved the creation of eight new municipalities in the area. Dunguan and Tapodoc became part of municipalities of
Nabalawag (
Bangsamoro Autonomy Act No. 43) and
Tugunan (
BAA No. 47), respectively, following ratification in a plebiscite on April 13, 2024. ==Geography==