José Castro was a Californio, born in Monterey, California when it was under Spanish colonial rule. His father José Tiburcio Castro was a soldier, member of the Diputación, mayordomo of Mission San Juan Bautista after it was secularized, and grantee of Rancho Sausal. As a young man, Castro was a vocal and active supporter of Californian self-rule and full independence from Mexico. His first public office was as secretary to the Monterey ayuntamiento. In 1830, Castro was arrested for his opposition to the Mexican governor of Alta California. By 1835 he was Vocal Primero of the legislature and acting governor. Along with his brother-in-law Juan Bautista Alvarado, he was a vocal proponent of California-born governors and sought a semi-independent status for Alta California. A long period in which far-away Mexico neglected California and sent up scandalous and incompetent governors culminated with six chief executives taking office in Monterey in 1836 alone. In November, 1838, Castro helped lead the overthrow of newly-appointed Mexican Governor Nicolás Gutiérrez,. An end to the rebellion was negotiated, and Alvarado became the legitimate governor from 1837 to 1842. Castro served under Alvarado as Lieutenant-Colonel of militia. Once again he was appointed First Member of the Diputación as well as Prefect of the District of Monterey. In 1839, governor Alvarado granted him Rancho San Justo, which included the settlement surrounding Mission San Juan Bautista. The grant followed the secularization of the mission by the Mexican government in 1833, which privatized former mission lands. Castro built an adobe house on San Juan Bautista Plaza in 1841. He used the house as an administrative base for his military operations, and as a residence for his secretary. Back in 1840, Alvarado had arrested about one hundred Americans in California and transported them to San Blas, an action that sparked an international diplomatic incident known as the "Graham Affair". By 1844–45, Castro was a leader of the new revolt against Governor Manuel Micheltorena, once again becoming Commandante General under new governor Pio Pico. During the Bear Flag Revolt of 1846 and Mexican–American War that followed, Castro was the commanding general of Alta California. When California joined the United States in August 1846, Castro left for Baja California, taking up residence in Sinaloa. Castro returned to Alta California in 1848, but by 1853 had gone to Mexico again where he was appointed governor and military commander of Baja California. After the Mexican–American War, José Castro opened his adobe house in San Juan Bautista to an Irish settler, Patrick Breen. Breen and his family were surviving members of the Donner Party. They arrived at San Juan Bautista in February 1848, nearly a year after completing their journey through the Sierra Nevada. The Breens were the first English-speaking Americans to live in the town. Castro allowed them to live at the house until they could afford to buy it from him. By 1853, Castro had left for Mexico, where he was appointed governor and military commander of Baja California. One of Patrick Breen's teenage sons made a fortune as a gold miner and purchased the house from Castro in 1854. The Breen family established a working ranch and an inn. Guests included gold rush prospectors and Helen Hunt Jackson, author of Ramona. She began writing her famous novel about Spanish California while living in San Juan Bautista in the early 1880s. The Breen family owned the house until 1935, when the State of California bought the property and it became part of the San Juan Bautista Plaza Historic District. Castro never surrendered his Mexican citizenship nor military rank. In February 1860, Castro was killed by Manuel Marquez, in an incident variously described as an assassination or a barroom brawl.
