Chah-Post-Kaw-Kaw is a fairly close rendering of Čap’ósgaga. This is from čap’ó, "breast"; sga, "white"; and -ga, the definite article used in personal names. The name is attested as that of the protagonist in a story about the Fox-Hočąk war of 1730. (Blowsnake-Radin)
Radin's map (51) shows Čap’ósgaga's village to have been located at present day LaCrosse, Wisconsin. Lyman C. Draper says, "Chah-post-kaw-kaw, or The Buzzard, ... settled with a band of Winnebagoes at LaCrosse about 1787 ..." (Draper, 297 note)
"His two sons were called Big Canoe or One Eyed Decorah, and Wakun-ha-ga or Snake Skin, known as Waukon Decorah." (Jipson, 228)
Frequently omitted from his list of sons is his eldest son Mąwáruga. Draper says that shortly after setting up in LaCrosse in 1787, Čap’ósgaga "was shortly after killed in a drunken row." (Draper, 297 note) It was, in fact, his own son, Mąwáruga, who killed him. Ever after Mąwáruga was shunned by the Winnebago, who considered him to be no better than an animal for having committed such a crime. (Grignon, 287)
Jasper Blowsnake and Paul Radin, "A Semi-Historical Account of the War of the Winnebago and the Foxes," Proceedings of the State Historical Society of Wisconsin (Madison: State Historical Society of Wisconsin, 1914) 62:192-207. Told by Jasper Blowsnake in June, 1908. A version in English only has been published in Paul Radin, The Winnebago Tribe (Lincoln: University of Nebraska Press, 1990 ) 11-17.
WikiTree profile DeKaury-11 created through the import of The Sammons Family Tree.ged on Jun 9, 2011 by Steve Sammons. See the Changes page for the details of edits by Steve and others.
Source: S2852711167 Repository: #R2852704208 Title: Public Member Trees Author: Ancestry.com Publication: Online publication - Provo, UT, USA: The Generations Network, Inc., 2006.Original data - Family trees submitted by Ancestry members.Original data: Family trees submitted by Ancestry members. Note: This information comes from 1 or more individual Ancestry Family Tree files. This source citation points you to a current version of those files. Note: The owners of these tree files may have removed or changed information since this source citation was created. Page: Ancestry Family Trees Note: Data: Text: 
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It may be possible to confirm family relationships with Čap’ósgaga by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Čap’ósgaga: