capital city
亰 centers on a capital city, the primary seat of governance and culture.
亰 is an older variant form of 京, which originally depicted a tall building on a hill, symbolizing a capital city. The extra stroke in 亰 is a graphical variation.
The 亠 top suggests a roof, and the lower part looks like a tall structure with a base. Imagine a grand building in the capital city.
For キョウ, picture the capital city of Kyoto (京都, きょうと): Kyoto -> キョウ, and the kanji represents the city itself.