Cerro Romualdo is a mountain in

San Luis Obispo County, California San Luis Obispo County (), officially the County of San Luis Obispo, is a County (United States), county on the Central Coast (California), Central Coast of California. As of the 2020 United States Census, 2020 census, the population was 282, ...

. The mountain is the fifth in a series of

volcanic plug A volcanic plug, also called a volcanic neck or lava neck, is a volcanic object created when magma hardens within a vent on an active volcano. When present, a plug can cause an extreme build-up of high gas pressure if rising volatile-charged mag ...

s called the

Nine Sisters The Nine Sisters or the Morros are a chain of twenty-three, although typically only nine are included, volcanic mountains and hills in western San Luis Obispo County, Southern California. They run between Morro Bay and San Luis Obispo. Geography ...

. Until 1964 the mountain was officially known as Romualdo Peak. The mountain is named for a Chumash man who received the

Rancho Huerta de Romualdo Rancho Huerta de Romualdo was a Mexican land grant in present-day San Luis Obispo County, California given in 1842 by Governor Juan B. Alvarado and in 1846 by Governor Pío Pico to Romualdo. The name means Romualdo's vegetable garden. The grant ...

Mexican land grant from

Pío Pico Don Pío de Jesús Pico (May 5, 1801 – September 11, 1894) was a Californio politician, ranchero, and entrepreneur, famous for serving as the last governor of California (present-day U.S. state of California) under Mexican rule. A member of ...

, the last Mexican Governor of

Alta California Alta California ('Upper California'), also known as ('New California') among other names, was a province of New Spain, formally established in 1804. Along with the Baja California peninsula, it had previously comprised the province of , but ...

. ''Huerta de Romualdo'' means ''Romualdo's kitchen garden or orchard'' in

Spanish Spanish might refer to: * Items from or related to Spain: **Spaniards are a nation and ethnic group indigenous to Spain **Spanish language, spoken in Spain and many Latin American countries **Spanish cuisine Other places * Spanish, Ontario, Cana ...

. He sold the land to Captain John Wilson in 1846. In the 1890s, rock from Cerro Romualdo was used in the construction of the

Southern Pacific Railroad The Southern Pacific (or Espee from the railroad initials- SP) was an American Class I railroad network that existed from 1865 to 1996 and operated largely in the Western United States. The system was operated by various companies under the ...

. Cerro Romualdo is owned by the

State of California California is a U.S. state, state in the Western United States, located along the West Coast of the United States, Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the List of states and territori ...

, and is used by the

California National Guard The California National Guard is part of the National Guard of the United States, a dual federal-state military reserve force. The CA National Guard has three components: the CA Army National Guard, CA Air National Guard, and CA State Guard. ...

at adjacent

Camp San Luis Obispo Camp San Luis Obispo is the original home of the California Army National Guard. It served as an Infantry Division Camp and Cantonment Area for the United States Army during World War II. History Camp San Luis Obispo, formerly called Camp Merri ...

for fitness training.

References

{{Nine Sisters Nine Sisters Mountains of California Volcanic plugs of California Landforms of San Luis Obispo County, California Volcanoes of California