Don Cayetano Juárez (1809 – 1883) was a Californio ranchero and soldier, who played a prominent role in the 19th century North Bay, particularly in Napa County.

He spent the winter of 1837-1838 establishing herds of horses and cattle in the Napa Valley while living for safety with his family close to Mission San Francisco Solano in Sonoma, California.

In his years of military service and public life in Sonoma, he established a close relationship with General Mariano Vallejo, the most powerful man of that community.

On October 6, 1840, Mariano Vallejo gave him a Mexican land grant, Rancho Tulucay, consisting of 8,865 acres (35.88 km2) east of the Napa River.

[2] Also in 1845, Governor Pío Pico awarded Juárez a second land grant, called Rancho Yokaya, consisting of 35,541 acres (143.83 km2) in what is now Mendocino County, California.

When two American prisoners of the Mexican forces were threatened with execution, Juárez traveled to Rancho Cotate and intervened to prevent the killings.

On August 2, 1882, Juarez sold 209 acres (0.85 km2) of his Rancho Tulucay land to the state of California for $11,506.00 for the purpose of constructing an insane asylum.

[1] A document published by the National Trust for Historic Preservation called Juárez "one of California's most influential Rancho Era pioneers", going on to conclude, "During the 1830s Cayetano waged many successful campaigns out of the Presidio of San Francisco and after his honorable discharge in 1836, Cayetano Juarez successfully transitioned from a loyal Mexican citizen and a soldier in the Mexican Army under General Vallejo and Lieutenant Martinez to a valuable mediator between the Americans, Spaniards and Indians.