Geography and Countries

The world is flat. It looks like this:

Roman Empire

The Roman Empire is located in the continents corresponding to Europe, northern Africa, western Asia, and North America. Specifically, it contains Brittania, which contains Londinium. The language is called Latin, but is in fact almost identical to Earth English. The leader of the Empire is called Caesar (formerly "Emperor", but it was renamed when it was first held by a woman).

The Empire uses metal coins for money. A gold is eight silver, a silver is eight copper and is allegedly kept at about a basic day's wage but is in practice usually a bit higher, coppers can be physically broken in eight and also are tied to a fluctuating number of black pieces so that inflation can happen.

Slavery exists. People become slaves via the Empire conquering new places, debt, parents selling their children, and being born to slave parents. Power plants are run almost entirely by slaves, supposedly because it's easier to teach the relevant skills to children who don't learn other things.

Jesus is a currently-alive spiritual leader and activist.

Corporal punishment is common in the judicial system.

Arbiters are a group of seasonchanges who are really dedicated to providing impartial judgments on things.

Verona

A country by the Great Lakes, surrounded by Rome. Anyone who physically gets there can stay, no questions asked. Run by New Year's gemini.