José Antonio Aguirre, commonly known as Don Antonio Aguirre, was a Spanish-born Californio merchant and ranchero, active in the Southern Californian cities of San Diego and Santa Barbara.

Rancho San Jacinto Nuevo y Potrero was a 48,861-acre Mexican land grant in present-day Riverside County, California given in 1846 by Governor Pío Pico to Miguel Pedrorena. At the time of the US Patent