Analysis of information sources in references of the Wikipedia article "Baler, Aurora" in English language version.
These people (Ilongot) scattered rancherias toward Baler and sustain trading relations with the Tagalog of that town, but are hostile with the Ilongot of Nueva Vizcaya jurisdiction.
When military district of El Príncipe was created in 1856, Baler became its capital...On June 12, 1902 a civil government was established, moving the district of El Príncipe away from the administrative jurisdiction of Nueva Ecija...and placing it under the jurisdiction of Tayabas Province.