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In page Julius Caesar:

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In Classical Latin, it was pronounced [ˈɡaːi.ʊs ˈjuːliʊs ˈkae̯sar]. In the days of the late Roman Republic, many historical writings were done in Greek, a language most educated Romans studied. Young wealthy Roman boys were often taught by Greek slaves and sometimes sent to Athens for advanced training, as was Caesar's principal assassin, Brutus. In Greek, during Caesar's time, his family name was written Καίσαρ (Kaísar), reflecting its contemporary pronunciation. Thus, his name is pronounced in a similar way to the pronunciation of the German Kaiser [ˈkaɪzɐ] or Dutch keizer [ˈkɛizər].[citation needed]