José Sisto, also called José Sisto Rodrigo and José Sixto, was twice Governor of Guam, first after overthrowing Francisco Martínez Portusach, and again after being legitimately placed in the position by the United States government. He served as Spanish administrator of the Public Treasury in Guam until the United States captured the island during the Spanish–American War. When Martínez was named Commissioner, Sisto quickly staged a coup d'état and claimed the position as the highest ranking Spanish official on the island. He began arming native guards and commandeering ammunition, but was briefly overthrown by Venancio Roberto and other pro-American elements on December 31, 1898, but was officially put into power by officers of the United States Navy only two days later after they decided he held a legitimate claim to the position. His second term was brief, and he officially relinquished control on February 1, 1899 after learning that the United States had obtained Guam.