Ancestry.com Family Trees has this information: Ambrose Allen b Jan 1840 Monroe Co. OH. , died Jul 6 1903 Plattsmouth NE, bur Corning Cemetery Nemaha Kansas. Married by 1860, Mary Ann Hunt b abt 1843 Monroe Co. OH. Daughter of Thomas Hunt b 1821 MD and wife Elizabeth b 1821 MD. She diedand Anbrose married her Aunt by the samename Mary Ann Hunt, dau of William Hunt b abt 1799 MD,and wife Ann ( ) b abt 1797 MD, 6 chidren. The Aunt was b Jan 28 1837 Monroe Co. OH, died Jul 18 1908 Nemaha Kansas. Ambrose the son of Joel Allen and Martha Ann ( ) .He married #2 Jul 12 1884. Served in the Civil War in Company "D" 92nd Reg. Ohio, and Company "H" 3rd Infantry Regiment Ohio.
I can't vouch for the correctness of this, as I am not related.Howard Boswell