The Katipunan, officially the Kataastaasan Kagalang-galang na Katipunan ng mga Anak ng Bayan and abbreviated as the KKK, was a revolutionary organization founded in 1892 by a group of Filipino nationalists Deodato Arellano, Andrés Bonifacio, Valentin Diaz, Ladislao Diwa, José Dizon, and Teodoro Plata. Its primary objective was achieving independence from the Spanish Empire through an armed revolution. It was formed as a secret society before its eventual discovery by Spanish authorities in August 1896. This discovery led to the start of the Philippine Revolution.

Deodato Arellano y de la Cruz was a Filipino propagandist and the first president of the Katipunan, which was founded at his home in Azcarraga Street, Manila. He was first to be given the title Supremo by the Katipunan. After studying bookkeeping in Ateneo de Municipal de Manila, he became an assistant clerk for the Spanish military. He was a member of the Freemasonry in the Philippines and became involved in the Propaganda Movement.