He was finally defeated by General Mariano G. Vallejo in 1826. The county is named for the Stanislaus River, first discovered by Gabriel Moraga in 1806, and later renamed Rio Estanislao for the Indian chief. In 1841, the general established a great stock ranch in this area to which he retired in 1850 when gold seekers deprived him of most of his holdings at Sacramento. The county is named for the City of Tehama. It takes its name from the Trinity River, named in 1845 by Major Pearson B. Reading, who was under the mistaken impression that the stream emptied into Trinidad Bay.
Trinity is the English version of Trinidad.
It is from this lake that the county derives its name. Tulare is found in the Mexican word tullin, designating cattail or similar reeds. The name Tuolumne is of Indian origin and has been given different meanings, such as Many Stone Houses, The Land of Mountain Lions and Straight Up Steep, the later an interpretation of William Fuller, a native Indian Chief. YOLO Created 1850. YUBA Created 1850.