The seat of power in Westeros and home to the Red Keep where the King of the realm upon the Iron Throne. Initially Westeros was a divided kingdom but once invaded and combined the landing point for the invaders was built upon and eventually turned into the capital of King's Landing.
Unlike other cities around Westeros, King's Landing has few paved roads or stone buildings, Most roofs are thatch made and the city is somewhat known for it's terrible and sometimes overpowering smell. It does claim a large castle, called the Red Keep, and is a major port for the realm. Not only a seat of power but also intrigue and the occasional battle for the Iron Throne.