Vibora, as any student of Philippine history knows, was the nom de guerre of General Artemio Ricarte, the first chief of staff of the Philippine Army formed by the Aguinaldo revolutionary government after the Tejeros assembly in 1897.
Ricarte when captured during the Philippine-American war refused to take the oath of allegiance to the US. He was exiled to Guam together with Apolinario Mabini. On their repatriation Ricarte again refused to take the oath with Mabini and was put on a ship for Hongkong.