The Atridean Colonial Empire (Atridean: Ατριδεανή Αποικιακή Αυτοκρατορία, Maroketi: امپراتوری مستعمراتی از اطخاجا) consisted of mainland Atridea and the overseas territories controlled by the Republic from the 19th to the 20th century, for 144 years. The Atrideans followed Brescia in establishing an overseas colonial empire, but based on military conquest of already-existing settlements, and not on discovery and colonisation. For this, they were aided by their skills in shipping and trade and the surge of nationalism accompanying the struggle for independence from Edirn. The Atrideans initially built up colonial possessions on the basis of indirect state capitalist corporate colonialism, via the Atridean East Orientia Company. Territories under Atridean control were Atridean North-West Sterilia, the Atridean Colony of Bangalar in India and the colonies of Dongguan and Kon-yi in Nanzhao.
With Atridean naval power rising rapidly as a major force from the late 18th century, Atridea dominated global commerce during the first half of the 19th century during a cultural flowering known as the Atridean Golden Age. The Empire was resolved in 1975 with the establishment of the Republic, since the colonies were no longer profitable for the metropole. The Atridean Colonial Empire was the last to decolonize.