Arcadius (Latin: Flavius Arcadius Augustus; Greek: Ἀρκάδιος; 1 January 377 – 1 May 408) was Eastern Roman Emperor from 383 to 408. He was the eldest son of Theodosius I and his first wife Aelia Flaccilla, and brother of the Western Emperor Honorius. A weak ruler, his reign was dominated by a series of powerful ministers and by his wife, Aelia Eudoxia.

Arcadius was born in Hispania, the elder son of Theodosius I and Aelia Flaccilla, and brother of Honorius, who would become a Western Roman Emperor. His father declared him an Augustus and co-ruler for the Eastern half of the Empire in January 383. His younger brother was also declared Augustus in 393, for the Western half.

As emperors, Honorius was under the control of the Romanized Vandal magister militum Flavius Stilicho while Arcadius was dominated by one of his ministers, Rufinus. Stilicho is alleged by some to have wanted control of both Emperors, and is supposed to have had Rufinus assassinated by Gothic mercenaries in 395; though definite proof of Stilicho's involvement in the assassination is lacking, the intense competition and political jealousies engendered by the two figures compose the main thread of the first part of Arcadius' reign. Arcadius' new advisor, the eunuch Eutropius, simply took Rufinus' place as the power behind the Eastern imperial throne.

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