Answer
The traditional language of Ilagan is Ibanag, an Austronesian language spoken primarily in the provinces of Isabela and Cagayan in the Philippines. It belongs to the Northern Luzon subgroup of the Philippine languages and is closely related to other languages in the region, such as Itawis and Gaddang. Ibanag has a rich oral tradition and is used in various forms of literature, including poetry, songs, and folktales.