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The name Monte del Diablo (‘Mount of the Devil’) appears on the "Plano topográfico de la Misión de San José" about 1824, where there was an Indian settlement at the approximate site of the present town of Concord .
On August 24, 1828, the name was applied to the Monte del Diablo land grant for which Salvio Pacheco had petitioned in 1827.
Eight bridges are visible, from west to east: San Mateo, Bay, Golden Gate, San Rafael, Carquinez, Benicia, Antioch, and Rio Vista.
Claims that the mountain's viewshed is the largest in the world—or second largest after Mount Kilimanjaro—are ill founded.
The name's origin was misinterpreted by English-speaking newcomers to refer to the mountain rather than the settlement.
Other renaming suggestions by other individuals included Mount Miwok and Mount Ohlone, after local Indian tribal names. Board on Geographic Names rejected the petitions, saying there was no compelling reason to change the name.
Finally he proposed Mount Reagan, but the board rejected it on the grounds that a person must be deceased for five years to have a geographic landmark named after them. In summer of 2009 Mijares again proposed the name Mount Reagan to the United States Board of Geographic Names because Reagan was now an eligible recipient of a place name.
Mount Diablo is sacred to many California Native American peoples; according to Miwok mythology and Ohlone mythology, it was the point of creation.
Prior to European entry, the creation narrative varied among surrounding local groups.