I found this in Vol. 3 of Genealogical Abstracts of Revolutionary War Pensions.
Frederick Unsell married Jane Masters. They were married in Washington Co., PAPension # W22472.He was born 25 Aug. 1765 in Frederick Co., MD.From there the family went to Little Wheeling, in Washington Co., PA.From there they went to Harrison Co. VA (now W.VA) then to Miami Co., OHIO, then to Mehlenburg Co., KY, next to "the White River, in Indiana. Marriage of Frederick Unsell and Jame Masters was 6 Dec. 1789 in Washington Co., PA His father died, and his mother remarried to Peter Ketchell or Ketchello. Jane Masters was born 17 Mar 1772He had several children and most settled in Clark Co., IL. It doesn't say, but it seems to indicate that Frederick died in Indiana, but not sure. The fact that many of you are looking in Muhlenburg Co. KY made me think you'd find some clues here.
My ancestor is Elizabeth Unsell who married John Frakes, and I have no idea who her parants were.I'm thinking they were somehow related to this Frederick.Write me at my e-mail address; firstname.lastname@example.orgMarianne