Twenty-one years after its first release, Age of Empires II adds a new game, known as Lords of the West. Three more campaigns and two completely new civilizations, Burgundians and Sicilians, were added too. Lords of the West is already out as an add-on to the Definitive Edition of the game, released in 2019. This newest addition at $10 only has made the Age of Empires II even stronger than other video games out there.
Source: https://kotaku.com/age-of-empires-ii-is-still-getting-new-civilizations-m-1846135269