Bagalangit was once under the jurisdiction of Bauan and San Luis. The coastal and lowland parts were under San Luis and the upland was under Bauan. That was during the Spanish Era up to the American Regime. But in 1918 when the town of Mabini was created through the leadership of Captain Francisco Castillo, Bagalangit became one of the twelve original barrios.

Based from research made by the writer the word Bagalangit originated from the two words "Baga" and "Langit", meaning embers and heaven rspectively. Thus based from the story coming from thr first settlers of the place, which was handed down from generation to generation, the legend goes this way.

Once there was a stranger who happened to take a walk from the seashore going up to the mountain, he felt warm as if there were hot smokers in his body, and he muttered "Baga". Although he felt awrm he walk as far as the top of the mountain peak. Upon reaching the top, he felt the fresh air and he was relaxed and said, "I am no longer tired, this is Langit". So from that time, the place was called Bagalangit.

During the early days the barrio head was called "Teniente". The first Teniente del Barrio were Tenienting Godyo, Tenienting Isko and Tenienteng Mariano. They were the first settlers in the barrio. Then followed by Tenientine Andres Abrigonda and Tenienting Jacinto Matibag who where not native of the place. The inhabitants who first settled the place came from Bauan and Taal. They became the landowners but they not stay in the barrio. They considered themselves as hacienderos, who from time to time visited their landholdings and animals. They entrusted their properties to their "Katiwalas". Due to the industriousness of the Abrigonda's and Matibag's and other hardworking families, they were able to purchase the parcel of land from the original landowners. The next abrrio head were Epifanio Abrigonda, known as Kabisang Panio, Nicanor Casapao, julio Abante, Benigno Matibag, Serafin Medina Sr. and Crispin Mendoza. Later on Alberto Canson and Juan Ilagan followed. The last barrio heads before the creation of the first barangay ouncil were Jose Mañibo, Benedicto Villanueva, Florentino Ilagan, Timoteo Dalawampu and Cirilo de Villa.

The first barangay council was composed of Amador de Villa as Barangay Captain and six councilmen. The second barangay council during Martial Law was composed of Barangay Captain Juan Medina, with Benjamin Dalawampu of sitio Parang, Jorge Albuera of sitio Balagbag, Bernardo Ilagan of sitio Gulod, jose Mendoza of sitio Punta, Arsenio Apostol of sitio Balitian and Eusebio Mendoza of sitio Looc.

After so many years of martial law until it was lifted, a barangay eection was held. Diego Abante Sr. was electe as barangay capatin, composing of councilman Benigno Caringal of sitio Balagbag, Elpidio Amboy of sitio Balitian, Reynaldo Bonado of sitio Gulod, Jaime Napeñas of sitio Looc, Victor Mendoza of sitio parang and Feliciano Mendoza of sitio Punta.

After several years barangay captain resign, and then Reynaldo Bonado as first barangay kagawad beacme barangay capatin. Then another barangay election came and Marcelo Mendoza won the election as baranagy captain, Jaime Napeñas, Elpidio Amboy, Victor Mendoza, Damian Candava, Lino Mendoza and again Benigno Caringal as Barnagy Kagawad. When Barangay Capatin Marcelo Mendoza resign the first barangay kagawad assumed the office of the barangay captain in the name of Barangay Captain Jaime Napeñas, up to the present time.