John Gordon told me years ago in an email that Korp is a sister of Prok, hence the name reversal. Prok is a pseudo-acronym for Persimmon Ralph Krieder (with a vowel for pronunciation). He indicated that both were seedlings of Pipher which is a large persimmon discovered by Ralph Krieder in Curro Gordo, IL in the eighties. Ralph told me that it was a very large, old graft left over from a forgotten farmstead that had since been subsumed into “progress”. The tree is dead and was removed years ago.