Icosium (Ancient Greek: Ἰκόσιον, romanized: Ikósion) was a Berber city that was part of Numidia which became an important Roman colony: in Icosium were settled many Roman colonists since Augustus times[1] and there was an early medieval bishopric (a Latin titular see) in what is now the casbah area of actual Algiers.[2]

Shown within Algeria
RegionAlgiers Province
Coordinates36.7763°N 3.0585°E / 36.7763; 3.0585