Gaius Julius Caesar Octavianus

…Being favored by Caesar, who had no legitimate sons, he accompanied him on his triumph in Africa and on his expedition to Spain. While studying in Apollonia with his lifelong friend Agrippa, he heard of Caesar's assassination and his adoption as heir in Caesar's will. Upon returning to Rome, he took the name Gaius Julius Caesar Octavianus as the successor to the prestigious Julius clan. He came into conflict with Antony, a powerful Caesar supporter, over the legitimacy of his inheritance, but they were able to reconcile while pursuing the remnants of the assassin's Republican faction. …

*Some of the terminology that mentions "Gaius Julius Caesar Octavianus" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…嫡子に恵まれなかったカエサルの愛顧を受け，アフリカ凱旋やスペイン遠征にも同伴した。生涯の友アグリッパと共にアポロニア遊学中に，カエサルの暗殺とその遺言による養子相続人への指名を伝え聞き，帰国後名門ユリウス氏族の後継者としてガイウス･ユリウス･カエサル･オクタウィアヌスGaius Julius Caesar Octavianusと名のった。資産相続の正当性をめぐってカエサル派の実力者アントニウスとは不和になったが，暗殺者の共和派の残党を追撃するなかで和解が成立した。…

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出典｜株式会社平凡社世界大百科事典 第２版について | 情報