The Confederation of Madya-as was a legendary pre-colonial supra-baranganic polity on the island of Panay in the Philippines. It was mentioned in Pedro Monteclaro's book titled Maragtas. It was supposedly created by Datu Sumakwel to exercise his authority over all the other datus of Panay. Like the Maragtas and the Code of Kalantiaw, the historical authenticity of the confederation is disputed, as no other documentation for Madya-as exists outside of Monteclaro's book. However, the notion that the Maragtas is an original work of fiction by Monteclaro is disputed by a 2019 Thesis, named "Mga Maragtas ng Panay: Comparative Analysis of Documents about the Bornean Settlement Tradition" by Talaguit Christian Jeo N. of the De La Salle University who stated that, "Contrary to popular belief, the Monteclaro Maragtas is not a primary source of the legend but is rather more accurately a secondary source at best" as the story of the Maragtas also appeared in the Augustinian Friar, Rev. Fr. Tomas Santaren’s Bisayan Accounts of Early Bornean Settlements (originally a part of the appendice in the book, Igorrotes: estudio geográfico y etnográfico sobre algunos distritos del norte de Luzon Igorots: a geographic and ethnographic study of certain districts of northern Luzon by Fr. Angel Perez) Additionally, the characters and places mentioned in the Maragtas book, like Rajah Makatunaw and Madj-as can be found in Ming Dynasty Annals and Arabic Manuscripts. However, the written dates go earlier since Rajah Makatunaw was recorded to have been from 1082 AD and was a descendant of Seri Maharajah (According to Chinese annals) while the Maragtas book placed him at the 1200s. J. Carrol in his article: "The Word Bisaya in the Philippines and Borneo" (1960) thinks there might be indirect evidence in the possible affinity between the Visayans and Melanaos as he speculates that Makatunao is similar with the ancient leader of the Melanao in Sarawak, called "Tugau".