The military camp, then city of Aquincum, located in part of what later became known as Óbuda, was built there by the Roman Empire.

The settlement, which existed from the 1st to the 4th century, had a military and a separate civilian area.

It had advanced infrastructure such as an aqueduct, a bath and two amphitheatres, one for the military and one for the civilians.

Several villas belonged to the settlement, and the Roman governor had his palace on Hajógyári Island.

The District Assembly, elected at the 2019 local government elections, is made up of 23 members (1 Mayor, 16 Individual constituencies MEPs and 6 Compensation List MEPs) divided into this political parties and alliances:[3] Óbuda-Békásmegyer is twinned with:[4]