Grand Ages: Rome - Reign of Augustus is an add-on for Grand Ages: Rome. It adds a new campaign with 12 missions which are about conflicts during the Era of Augustus. Just like the base game these missions don't tell stories but give specific goals which the player has to fulfill.

It also adds two new gameplay features: Authority gets generated by certain buildings and can be used for various actions, e.g. putting out fires, and the player can build roads which result in faster unit movement and additional resources. Another important addition are four new buildings: odeum (brings entertainment), tax office (brings money), senate (brings authority) and hospital (brings a fallen unit back to life). The last additions consist of six multiplayer maps, 20 new estate bonuses, 21 new talents and three new patrons.