We really need to exchange some info and sources. I am pretty sure that the Jacob who married Christina Mowry was actually the son of Augustine's older brother John. This John was my ggggggrandfather who left Augusta Co. sometime in 1807 and moved to Ross County, Ohio where he lived out his life east of the town of Chillicothe. John died on his farm on September 1, 1825, and in succeding years his sons and daughters as heirs filed quit claim deeds selling their claim. Among those on file in the Ross County Probate Court records is the quit claim of Jacob and his wife Christina who had remained in Augusta County and filed their claim on March 2, 1841. I live in Chillicothe and have studied all of these probate court records personally.
Please email me directly at firstname.lastname@example.org
so that we can compare notes and exchange sources more thoroughly.