José de la Guerra was a prominent figure in early California history, known for his role as a military leader and landowner. Born in 1790 in Spain, he moved to California during the Spanish colonial period. He served as a commander at the Presidio of Santa Barbara and played a significant role in the region's defense and governance. In addition to his military contributions, de la Guerra was a successful rancher. He owned large tracts of land, including the famous Rancho San Julian, which became a vital agricultural area. His influence helped shape the development of California during the transition from Spanish to Mexican rule.