Considerable interest attaches to his early companionship with Wilhelm Neumann and certain others, among whom were the writer Karl August Varnhagen von Ense and the poet Adelbert von Chamisso.
Infatuation for Fanny Elssler, the celebrated danseuse, forms, the subject of some remarkable letters to his friend Rahel, the wife of Varnhagen von Ense (1830-1831).
Finally Gentz's diaries, from 1800 to 1828, an invaluable mine of authentic material, were edited by Varnhagen von Ense and published after his death under the title Tagebiicher, &c. (Leipzig, 1861; new ed., 4 vols., ib.
Varnhagen von Ense, Preuss.
P. Varnhagen von Ense, Blcitter aus der preussischen Geschichte, 5 vols.