He took up the study of theology, mainly at Göttingen, and began life as a private tutor. Turning to the study of history, he carried with him the tendency to construct his syntheses upon the scanty basis of 18th century generalizations; yet in spite of the growing scientific school he became and remained for a quarter of a century the most popular German historian. In 1807, inspired by his study of Dante, he published his first work Abélard und Dulcin, a defence of scholasticism and medieval thought. Two years later biographical studies of Theodore Beza and Peter Martyr Vermili (Leben des Theodor de Bela und des Peter Martyr Vermili, Heidelberg, 1809) revealed more genuine scholarship. In 1812 appeared his History of the Iconoclastic Emperors of the East (Geschichte der bilderstürmenden Kaiser des oströmischen Reichs), in which he controverted some points in Gibbon and sought to avoid painting the past in present-day colours. His own strong predispositions prevented him from accomplishing this, however, and the history remains open to grave scientific criticism. But it won for him the favour of Archbishop Karl Theodor Dalberg, and secured for him a professorship in the Frankfurt Lyceum. He left Frankfurt in 1819 to become professor of history at Heidelberg, where he resided until his death.
In 1815 appeared the first volume of his World History (Weltgeschichte in zusammenhängender Erzählung). This work, though never completed, was extended through many volumes, bespeaking an inexhaustible energy and a vast erudition. But it lacks both accuracy of fact and charm of style, and is to-day deservedly quite forgotten. On the other hand a translation of the pedagogical handbook of Vincent of Beauvais and the accompanying monograph are still of value. The next noteworthy work was a history of antiquity and its culture (Universalhistorische Übersicht der Geschichte der alten Welt und ihrer Kultur, 1st part, 1826; 2nd part, 1834), which, while revealing little knowledge of the new criticism of sources inaugurated by F.A. Wolf and B.G. Niebuhr, won its way by its unique handling of the subject and its grand style. In 1823 he published in two volumes a Geschichte des 18ten Jahrhunderts; then, enlarged and improved, this work appeared in six volumes as Geschichte des 18ten Jahrhunderts und des 19ten bis zum Sturz des französischen Kaiserreichs (1836-1848). The history had a most extraordinary success, especially among the common people, owing, not to its scientific qualities, but to the fact that the author boldly and sternly sat in judgment upon men and events, and in his judgments voiced the feelings of the German nation in his day. For this very reason it is no longer read. It has been translated into English by D Davison (8 vols, 1843-1852). Finally, Schlosser undertook a popular World History for the German People (Weltgeschichte für das deutsche Volk, 1844-1857), which also enjoyed the favour of those for whom it was written.
Schlosser stands apart from the movement towards scientific history in Germany in the 19th century. Refusing to limit himself to political history, as did Ranke, he never learned to handle his literary sources with the care of the scientific historian. History was to him, as it had been to Cicero, a school for morals; but he had perhaps a juster conception than Ranke of the breadth and scope of the historian's field.
See GG Gervinus (Schlosser's pupil), F. C. Schlosser, em Nekrolog (1861); G Weber, F. C. Schlosser, der Historiker, Erinnerungsblätter (Leipzig, 1876); and O Lorenz, F. C. Schlosser (Vienna, 1878).