Imperator: Rome is Paradox's big new grand strategy game, due out in 2019.

The game, made by Paradox's internal development studio (Europa Universalis, Crusader Kings), lets you explore alternative histories. Here's the set-up:

"What we think of as 'western civilisation' was not guaranteed. Imagine Alexander's empire centralised under one successor. Italy might never have been unified under Roman rule, strangling a juggernaut in its cradle. A world without Caesar. Now you can explore these alternate histories in Imperator: Rome."

In the game, you can rule any nation on "the most detailed Paradox map ever", which stretches from the Pillars of Hercules to India. So, you can build an empire that dwarfs that of Alexander. The trick is to govern republics or monarchies while balancing the factions and keeping the loyalty of your generals.

Here's a look at the map:

And here's the announcement trailer:

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Here's a list of Imperator: Rome's features, per Paradox: