I believe Dennis Allen died prior to the 1850 census. The book "Irwin County, Georgia, Marriage Records, 1820-1928" compiled by Tad Evans show that Dennis Allen and Mary Fussell were married 10 March, 1822. My ancestor Henry Allen 111 was married in the same county to Easter Wells 11 Aug, 1825. A neice of Dennis and Henry named Eliza Allen (daughter of James Allen) married David Gornto 20 Nov, 1827. All marriages in Irwin Co. I don't know if there is a connection or not but if General Jackson Allen is a son of Dennis Allen it appears a nephew of Gen Allen lived in LA with his family sometime between 1880-before the 1900 census. That person being David J Allen. He being a son of James Allen and a grandson of Dennis Allen. By 1900 that family had migrated to Trinity Co, TX. I see where earlier in this thread where you corrected the presumption that the progenetor of these Allens was Lydell Allen. I strongly believe these Allens originated in Duplin Co, NC. Henry Allen SR died and left a will in 1795 which named Henry Allen Jr as a son. This Henry Allen JR migrated to Bulloch Co, GA and died in GA sometime prior to the time of the 1820 census. I have a copy of a 1817 Duplin Co deed that shows where Henry Allen JR, then a resident of Bulloch Co, GA sells the remainder of his Duplin Co, NC holdings. I have nothing to tie all of the Allen brothers to this Henry Allen JR though except the Duplin Co, NC census records which show the number of young males in his household which closely matches the Allens of south GA and north FL that the editor Benjamin T Allen described in some of his newspaper articles about his Allen ancestors. Other circumstantial evidence is the marriage records of brothers Isaac Allen and James Allen show their marriages taking place in Duplin Co. Isaac Allen served in the War of 1812 from Duplin Co. The newspaper that Benjamin T Allen was the editor of was microfilmed by the Univ of GA. Benjamin T Allen was a grandson of Dennis Allen.