[2] Rancho Collayomi encompassed three square leagues in the Loconoma Valley.
Robert T. Ridley (1818 - 1851) was an English sailor who was captain of the Port of San Francisco.
In 1843, Ridley traded his three league Rancho Collayomi grant to Jacob P. Leese for the two league Rancho Canada de Guadalupe la Visitacion y Rodeo Viejo near San Francisco.
[3] With the cession of California to the United States following the Mexican-American War, the 1848 Treaty of Guadalupe Hidalgo provided that the land grants would be honored.
The following year, Simpson deeded half the lands to Ritchie's wife, Martha and children.