Belisson
Belisson is a large Lush planet, inhabited by Humans. There is only one continent, which is named Centros.
Centros
Centros is controlled by several houses throughout it's history. Up until the formation of the Kingdom of Centros, all houses practically worked as independent kingdoms. Shortly before the formation of the Kingdom of Centros, the houses Baratheon, Lannister, Stark, Tyrell, Arryn, Martell and Tully occupied all territory in Centros.
The Kingdom
Establishment
After a year of relative stability without wars throughout Centros, Robert Baratheon wanted to unite the houses under one kingdom, to create a peaceful and prosperous society that wouldn't plunge into a wartime again.
Meetings
House Baratheon controlled a large region, named the Stormlands. In one of its larger cities, Stormhaven, he built a large tower. Once its construction was finished, he invited the lords of the 7 houses to meet there to form a kingdom. Several meetings were held to decide the future laws, army, diplomacy, economy and various other topics.
Divide of the Regions
After numerous meetings, the topics of territory was brought up. The 7 houses had to decide what territories each house would own. The Lannisters demanded that House Bolton should become independent from the Starks. The Tyrells said they'd allow the creation of the houses Langton and Jorgensen. In reality, these houses were still loyal to house Tyrell, but on paper they were made independent.
Choosing the king
The independence of the Boltons, Langtons and Jorgensens expanded the council to 10 lords. After several meetings, each lord was given a vote to decide which lord they would name king. The Lannisters, Starks, Tyrells, Tullys and Arryns voted for Robert Baratheon, receiving 5 votes. The Martells, Langtons and Jorgensens voted for Mace Tyrell, receiving 3 votes. The Boltons voted for Tywin Lannister, receiving 1 vote. The Baratheons voted for Henric Jorgensen, receiving 1 vote as well.
The vote concluded Robert Baratheon as the new king. Though the Baratheons did not receive all 9 votes, but instead only 5, all houses approved of Robert Baratheon ruling as king.
Territories
Crownlands
Formerly belonging to the Baratheons, the Crownlands are a neutral region in which King's Landing, the capital of the Kingdom, is located. King's landing, formerly known as Stormhaven, is an old city which was chosen as capital due to its proximity to water and central position. Before it became the capital, the city was relatively small. After the kingdom was established, various national buildings were built within King's Landing. With those new buildings, new streets and new houses were created, increasing the size of the city drastically.
Stormlands
The stormlands are a region belonging historically to the Baratheons.