Jacob Rosenbaum
born 1829 in Kostrzyn nad Odra, Lubuskie, Poland(near Frankfurt am Oder) border between Germany and Poland, not far from Grunberg (now Zielona Gora) where the husband of Flora, Louis Schachne came from.
went to the Gold Rush in 1848 at 19 years old in order to try to earn enough money
to marry Emma Elsberg , parents of Flora Rosenbaum, who married Louis Schachne.
So I guess Jacob Rosenbaum knew about Louis Schachne from their?
by Isi Schachne