Rancho Arroyo de Las Nueces y Bolbones

[1] The grant was named after the principal waterway, Arroyo de las Nueces (Walnut Creek), and for the local group of indigenous Americans (known as Bolbones in Spanish, also known as Volvon).

The grant was on the western slope of Mount Diablo and includes the area of the present-day city of Walnut Creek.

He was the son of Juan Salvio Pacheco (1729–1777) and Maria Carmen del Valle, who came to San Francisco in 1776 with the De Anza Expedition.

[3][4] With the cession of California to the United States following its victory in the Mexican-American War, the 1848 Treaty of Guadalupe Hidalgo provided that the historic Spanish and Mexican land grants would be honored.

Shortly before American pioneer John Marsh of Rancho Los Meganos died in 1856, he and Ygnacio Sibrian were involved in a bitter court trial.