Gabriel Antonio de Vildósola purchased the Santa Barbara Ranch from Nicolás Romero, son of Diego Romero, the year before the Pima uprising, a coordinated attack on Spanish missions and settlements was carried out by O'odham dissenters
The collection contains a bill of sale, dated October 28, 1756, at Real Presidio de Santa Rosa de Corodehuachi de Fronteras. The Santa Barbara estate was sold by Gabriel Antonio de Vildosola to Maria Rosa Bessera Nieto, with endorsements by Gabriel Antonio de Vildosola, Joseph Antonio de Vildosola, and Juan Baptista de Anza.