Theodosian Dynasty - Theodosius

Japanese: テオドシウス朝 - テオドシウスちょう（英語表記）Theodosius

The period refers to the period following the death of the Roman Emperor Theodosius I (395), in the eastern part of the empire, through Emperor Arcadius, until the death of Theodosius II (450), and in the western part, through Emperor Honorius, until the death of Valentinian III (455). Because a succession of minor emperors based their legitimacy on the dynastic ideal, most of the real power in governance was held by court officials and military commanders. Legally, the Roman Empire was still one, but the differences between the Eastern and Western empires were growing, and the Western Empire in particular was in decline due to successive invasions by Germanic tribes.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

ローマ皇帝テオドシウス1世の死(395)後，帝国東部ではアルカディウス帝を経てテオドシウス2世の死(450)まで，西部ではホノリウス帝を経てウァレンティニアヌス3世の死(455)までをいう。王朝理念を正統性の根拠として幼少帝が続いたため，統治の実権はほとんど宮廷役人や武将に握られた。この時期，法制的にはローマ帝国はなお一つだが，東･西両帝国の様相は相違性を強め，特にゲルマン諸族の相次ぐ侵入を受けた西部の衰勢は著しかった。

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

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