Have you been able to obtain any information on Rev. Niebuhr? I believe he was the father of the famed theologian Reinhold Niebuhr. One of my ggrandmothers was an Elizabeth Niebuhr whose roots are Prussian, but she died in a Mennonite Colony in South Russia. I believe all Niebuhrs descend from Prussia and am wondering if there's any connection my Niebuhr ancestors and those of Gustav's line.