DescriptionPompeys Pillar, a large sandstone butte, was named in July 1806 by Capt. William Clark in honor of Sacagawea’s son, Jean Baptiste Charbonneau, whom he had nicknamed “Pomp.” Clark carved his name on the rock on July 25, 1806. Nicholas Biddle, the first editor of the Lewis and Clark journals, changed the name from Pompy’s Tower to Pompeys Pillar. Native Americans called the pillar Lisbi’iaassaao, “Place where the mountain lion lies.” Pompeys Pillar, named a NHL in 1965, received further recognition as a national historic monument in 2001.Personal NamesClark, WilliamCharbonneau, Jean BaptisteBiddle, NicholasOther Name(s)Pompeys PillarPompy's TowerLisbi’iaassaaoContributing InstitutionMontana Historical Society Library and ArchivesGeolocation[1] Elevation2985 ft.CountyYellowstone County
