Lassen Peak was named in honor of the Danish blacksmith Peter Lassen, who guided immigrants past this peak to the Sacramento Valley during the 1830s.
Banner Lassen Medical Center and Lassen College in Susanville, Lassen County, California, Lassen National Forest, Lassen Peak and Lassen Volcanic National Park are named after him.
William Nobles (guide), 1851 trail guide through Emigrant Gap in Sierra Nevada, see Lassen Peak
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