I have Peter Barkeman in my family tree, father of Isabelle who married Luther Anthis 25 Mar 1877 in Knox County. I'm assuming they are related to the Barickman (Bergman in German) family that settled in Vincennes in the late 1700's from Pennsylvania (as noted in June Barekman's book). I think all the possible spellings of the last name are causing some confusion. Other than the History of Knox County published in 1886, I've been unable to find documentation of this Isabelle or her father, Peter.