The Romans can be called the great inventors of myths with the purpose of propaganda. Think of
Or Augustus: he reunited the Roman Empire; part of his power was due to huge efforts in propaganda, visible e.g. in the mass of coins showing his face, being sent all over the empire. He understood very well, that different cultures used different symbols - and he used them for his propaganda.
Politically the Roman army was an important factor. Propaganda in that case was used for the soldiers on the one hand, but on the other hand also for demonstrating the power of the army to the people, so they could trust in its strength. Even then security was an essential factor of politics. As long as the army functioned, the Roman Empire did as well (
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The German philosopher Walter Benjamin (1892-1940) and author believed in the duty to educate people (including children) politically. In the German radio he had a series where he tried to do this. These texts are most important for Radio work - even today. Still he is more famous for his critiques on literature and art. Benjamin immigrated to Paris in 1934 and killed himself in 1940 at the boarder between Spain and France as he was afraid to get caught by German troops.