Among the documents was "Las Antiguas leyendes de la Isla de Negros", a two volume leather bound work that was supposedly written by a Friar José María Pavón in 1838 and 1839. The Code of Kalantiaw, in chapter 9 of part 1, was one of six translated documents that were dated before the arrival of the Spaniards in the Philippines. The original Code was purportedly discovered in the possession of a Panay datu in 1614. At the time of Pavón's writing in 1839 it was supposedly owned by a Don Marcelio Orfila of Zaragoza. On July 20, 1915, Robertson submitted a paper about the Kalantiaw Code to the Panama-Pacific Historical Congress in California and then published an English translation of the Code in 1917.