Mt. Diablo, California, was once part of what Spanish rancho?

Answer 1

(1)
Mt. Diablo, Ca. 1805-1806 The naming of Mt Diablo. General Mariano G Vallejo, in an 1850 report to the Legislature, gives the derivation of the name of Mt Diablo from its Native American to Spanish to Anglo form. In 1806 Spanish soldiers were pursuing native Americans as part of the missionization, the natives took cover in a thicket near Pacheco and the Spaniards camped with the intention of rounding them up in the morning. During the night the natives escaped across the Carquinez Strait, an act only possible, according to the Spaniards, with the help of the Devil ("Diablo"). The thicket became known as "Monte del Diablo" and Anglo settlers later misunderstood that the word "monte" can mean "thicket" or "mountain", and fastened the name on the most obvious local landmark.

1822 & 1824 Spain ceded California to Mexico, the Mexican Revolution took place and the beginning of land grants, including 18 in what became Contra Costa County. Between 1833 and 1846 three Rancho San Ramon Mexican land grants established to Bartolome Pacheco (southern San Ramon Valley) and Mariano Castro (northern San Ramon Valley, two square leagues), and Jose Maria Amador (four leagues).

7-31-1834 Ranch Arroya de las Nueces y Bolbones or ‘Rancho Miguel’ 17,782 acres were granted to Don Juana Sanchez de Pacheco including Pine Canyon, Little Pine Canyon and the North Gate Road area, Diablo and Turtle Rock Ranches. Approximately ¼ of the land grant is within the State Park today.

(2)

For example, Turtle Rock Ranch, named for a large nearby rock formation, was originally part of one of the earliest Mexican land grants, the 1834 Rancho Miguel.