 On July 6, 1892, upon learning of Rizal's exile to Dapitan island in Mindanao, Plata, Bonifacio and Diwa decided to form a secret society to prepare for a revolution against Spain.The following day, they met with their friends and fellow freemasons Deodato Arellano, Valentin Díaz and José Dizon at a house in Tondo and established the Katipunan.In 1892, he served as the secretary of the secret society with Arellano as president, Bonifacio as comptroller, Diwa as fiscal, and Díaz as treasurer.