Westeros, the setting of Game of Thrones, is divided into the Seven Kingdoms, but there's really nine of them.
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The reason for the name comes from Aegon's Conquest.
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Westeros was made up of seven independent states when he conquered it.
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He was crowned Lord of the Seven Kingdoms, despite the fact Dorne remained independent for almost 200 years afterwards.
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Aegon also split The Isles & the River, making the Iron Islands and the Riverlands.
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He also made King's Landing and the surrounding areas into a province called the Crownlands, making nine kingdoms, but the name Seven Kingdoms stuck.
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In the Game of Thrones finale, the North declares independence from the rest of Westeros.
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This makes Bran the Lord of the Six Kingdoms, but really it's eight.
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