History of Greece
According to the scanty records, Mitford spent much of his life prostrate and suffering from an illness for which there is little information, possibly stemming from depression. Ill, and suffering from Alzheimer's, according to the symptoms described, he died in 1827 at the age of 87 in the manor house where he had spent most of his life. There is no extensive biography of the historian, and there is little biographical information about him in contemporary books on British society at the time. The brief and limited biography written by his brother for inclusion in the posthumous edition of The History of Greece of 1829 dwells little on his private life and turns into a fervent defence of his work, his intellectual capacity and his authority as a social agent. This defence was clearly intended to ensure that The History of Greece would continue to have the importance it had achieved in the year of its first edition, which was being questioned at the time.