Irong-Irong (or Ilong-Ilong) appears in the Maragtas legend of the coming of ten Bornean datus (i.e., chieftains) to the island of Panay. The datus bartered with a local Ati chieftain for the plains and valleys of the island, offering gold in return.
One datu, Paiburong, was given the territory of Irong-Irong, which is now the province of Iloilo in the Philippines.
References
Irong-Irong Wikipedia(Text) CC BY-SA