Grand Ages: Medieval
Grand Ages: Medieval remains an acquired taste, but it's certainly the most accessible game in the series to date. The trading mechanics are intuitive enough to avoid confusion, while remaining complex enough to encourage micromanagement and enjoyable risk-reward tinkering. Simplistic combat and a lack of variety mean that it begins to run out of steam by the end-game, but if you're looking for a more relaxed approach to world domination, Grand Ages: Medieval is a perfectly solid option.
Grand Ages: Medieval is a game targeted at a niche of gamers, those who might find even classic history-based titles like Europa Universalis IV or Medieval: Total War lacking when it comes to the economic department.