According to her very brief autobiography, Martha Jane Canary was born in Princeton, Missouri, on this date in 1852. That may or may not be any more truthful than the rest of that short work. A decent brief biography is found at the Adams Museum & House web site.
What’s unbelievable is to watch the wonderful portrayal of Jane by Robin Weigert on Deadwood, and then think that Calamity Jane was played by Doris Day in the movie Calamity Jane (1953) and Jane Alexander in the made-for-TV movie Calamity Jane (1984).