I am also stuck on a Jacob Gilman, but much later than yours.Maybe mine is a descendent of yours??? My earliest Jacob Gilman was born c1829 in IL and died 4/9/1887 in Arkadelphia, Clark County, AR.He was the son of Mr. (first name unknown - maybe Jacob?) and Elizabeth (maiden name unknown) Gilman.Jacob's siblings were:Susan, Eliza E., and Rebecca Gilman; all born in IL.There may be more that I am not aware of.
Jacob Gilman married Serena Bolt (also born in IL) on 6/22/1843 in Clark County, AR.Their children were named: Elizabeth E., Mary E., Sarah J., Nancy Leanna, Rebecca, Alvira, Jacob "Jake", Albert, and Levi Gilman.
Is there any possibility that my line of Jacob Gilmans somehow connects to yours?