Medieval City Management Simulator 5

The world's technology is close to the European Middle Ages. Magic has been added slightly, but the number of magicians is so small that magic rarely affects daily life.
The continent is a peaceful land unified by the Maina Empire. The Maina Empire unified the continent about 300 years ago and brought peace to the continent and its surrounding islands. The imperial army is still strong, and the imperial navy, in particular, is large and strong enough to exert influence worldwide.
The Maina Empire is a country with a solid class system. It allows slavery, and slaves mainly work on farms or in mines.
The Duchy of Sicily rules the island of Sicily and the small islands around it. The direct territory of the Duke of Sicily is limited to the island of Sicily, and the small islands spread around the island of Sicily are ruled by counts who have received them as fiefs. According to the contract, the Duke of Sicily has no right to interfere in the counts' rule if they pay taxes well. The counts have faithfully paid taxes so far. The contract is also valid in the relationship between the Duke of Sicily and the Emperor. If the Duke of Sicily diligently sells grain to the imperial mainland, the Emperor and the imperial government cannot interfere with the Duke of Sicily's rule of the duchy.
The island of Sicily is one of the five major granaries of the Maina Empire. Although the island is not large, it is fertile and has good weather, making it very suitable for farming. In addition, the north, east, and south of the island, except for the west of the island where Palermo is located, have high cliffs, making it very unsuitable for building ports, so controlling only the west of the island where Palermo is located is enough to rule the entire island. The reason why Palermo is the capital of the duchy is also because ruling the west of the island, including Palermo, makes it easier to rule the entire island.
Palermo is the largest city on the island of Sicily. The population reaches 300,000, surrounded by high walls, and the city's defenses, led by the Duke of Sicily's manor, are also very high. In particular, the port's defense facilities are so excellent that the port cannot be blockaded unless it is the imperial navy composed of thousands of ships.
The island of Sicily is under the influence of the Maina Empire's navy, and the imperial government considers the grain coming from the island of Sicily, one of the five major granaries of the empire, to be very important in order to gain the support of the imperial subjects. This is why the imperial navy patrols the waters around the island of Sicily from time to time, ensuring that pirates cannot even look at the island of Sicily. Thanks to this, the Duchy of Sicily only operates a guard for the army. Of course, the Duchy of Sicily also operates a powerful navy with overflowing funds.
The island of Sicily is located in the middle of the South Sea and is an important island to be used as a stopover for trade with the Southern Continent. The merchants of the island of Sicily have accumulated a lot of wealth through intermediary trade, and the Duchy of Sicily, which collects taxes from the merchants, is also wealthy. The most imported commodity from the Southern Continent is 'slaves'. There are many farms, mines, etc., in the empire that require a lot of labor, and slaves are a popular commodity among farmers and mine owners. Grain is not a popular commodity for merchants because the imperial government buys it all.
The 'Sicily' family, which rules the Duchy of Sicily, is a long-established family that has ruled the island of Sicily since before the Maina Empire was founded.