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. Jacob Primer Leese (1809 - 1892), was a trader from Ohio who had married María Rosalia Vallejo sister of General
Vallejo, and was the owner of the adjacent
Rancho Guenoc. 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. As required by the Land Act of 1851, a claim for Rancho Collayomi was filed with the
Public Land Commission in 1852, and the grant was
patented to
Archibald A. Ritchie and Paul.S. Forbes in 1863. Ritchie was killed in an accident in 1856. Paul Forbes sold his share of both Rancho Guenoc and Rancho Collayomi to one of Ritchie's sons-in-law, Gen. M.D.L. Simpson, in 1867. The following year, Simpson deeded half the lands to Ritchie's wife, Martha and children. The heirs began selling portions of the properties in the early 1870s. ==References==