The political territory of what is now Reina Mercedes had many old names. It was first known as Abbag, Calanusian, then Calering, and finally Reina Mercedes. In one account, Itugud was mentioned as the old name of the locality of what is now Reina Mercedes; however, records of the Order of Preachers revealed that old Itugod, founded in 1678 by Fray Pedro Jimenez, is actually Barangay Lenzon (Alenzon in old manuscripts) in Gamu town outside the present territorial jurisdiction of Reina Mercedes.
Geographic Location
The Municipality of Reina Mercedes is situated in Central Isabela. It is a satellite municipality of Cauayan, a growth center of the province of Isabela. Its terrain is generally flat rolling. It is bounded on the north by Naguilian; on the east by Cagayan River; on the south by Cauayan; and on the west by Luna. The poblacion is approximately 23 kilometers south of Ilagan on the national highway and 10 kilometers north of Cauayan.
