Anyway, the capitol is called the 4-9 City because 4 gates, 9 districts, because that's how the city looks like, and the 9 districts is like a tictactoe grid, so at the center is obviously the emperor's place, so it's called the 9-5 seat, if you count it from right to left, top to down. But this is only the current capitol, back in Chang An, it was the 9-2