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By associating ethical liberty (Kant) to historical effectivity (Hegel), could Droysen be the 'missing link' that allows us to see, in history, the accomplishment of the idea of humanity? According to him, history only becomes intelligible if it can communicate the traces of freedom that lie within. Droysen belongs in the lineage that, after Kant, leads from Humboldt to Dilthey, Max Weber and Habermas. A student of August Boeckh and Hegel, philologist and historian, Johann Gustav Droysen (1808 1884) is one of the great theoreticians of historical science. In relation to the school of Ranke, ('history is saying how things happened'), Droysen appears as a rebel, with his contentious theory: 'The mission of historical science is not to establish historical facts'."