Kingdom of Mysticus
The kingdom spans from the western wildernesses to the Tumultuous Sea on both the south and east. The western wildernesses are mountainous and desolate, but the neighboring dwarves live in underground cities just beyond the fertile lands claimed by the kingdom. Few people have traveled through the western wildernesses or know what's beyond.
The north is bordered by a great, impenetrable, magical wall: The Doom Keeper. It's been there since time immemorial and bards like to tell tales about its origins. It is generally agreed that it keeps out a great evil on the other side, but what exactly that evil is, is a subject of speculation. The ancient city of Arduk sits right up against the wall.
The kingdom was formed by unification of 8 regional kingdoms, centuries ago, that are now the main duchies. The calendar was restarted upon unification. There are semi-autonomous states around the outside of Mysticus, but they are mostly city states, and their lords are off-and-on vassals of Mystican nobles.
Mysticus is more of an empire than a kingdom, because it incorporates diverse people groups and races. However, it is predominantly human with Elves as a significant minority. Dwarves tend to live in the west purely because few ever migrated very far from their underground cities in the mountains.
Gnomes are common as traders and entertainers, and rarely settle. Tribes of orcs, not truly affiliated with the kingdom live within its borders. They mostly keep to themselves, but lords will sometimes hire tribes to help in battle.
Other races appear in much, much smaller numbers.
The kingdom is winding down from a successful campaign against a rebellion. Most of King Horatius' staunchest allies are weak from fighting, but so are his enemies. However, the allies he had to persuade to join him in defending his throne tend to be much stronger, if war weary.
A city and its surrounding area will typically be overseen by a Baron or Baronness and run, in a day-to-day sense, by a governor appointed by that noble. Baronies are grouped into Duchies, though a Duke/Duchess will often retain direct control over one city.
The church has a prestigious and powerful role in society. Its influence has grown since the rebellion. But it does not support an army of its own. The church is led by a Triumvirate of Holies who officially wield no political power, themselves. Cities typically each have a bishop who is a close advisor to the lord.
The church is a pillar of society. The deity Laelia (lawful good) is the supreme goddess. Her three sons, Jove (neutral), Sergius (chaotic good), and Crispinus (neutral good) are also worshipped. Her daughter, Cornelia Agar (lawful evil) is illegal to worship, though, near the Doom Keeper, there are shrines to her where she is openly venerated. The church and the state frown on these shrines but do not disturb them. Cornelia Agar is believed to have a hand in sustaining the Doom Keeper, itself.
The military is built according to feudal codes. All nobles are officers, and all officers of rank Captain or higher are noble. But average troops tend to be peasants. Each lord is responsible to his or her leige to maintain an army, and to be prepared to scale up the army rapidly, in case of war. This last requirement is often not met, now, since the long rebellion.