TIL how Beijing ("North Capital") could previously (well, one of the previous times) have been Zhลngdลซ ("Middle Capital"). Sounds obvious, there must have been some other capitals in at least two directions, but I never looked up what those cities were.
The summer capital of Shร ngdลซ (Xanadu! Yes! That one!) ("Upper Capital") was north of it, in today's Inner Mongolia.
In contrast to my assumption above though, there doesn't seem to have been a Lower Capital at the time. There was a Xiร dลซ during the Yan dynasty in the Warring States Period, but that's over 1000 years earlier, so that must have been lower than something else.
*looks it up*
Xiร dลซ was below Yan, which was the main capital of the Yan dynasty. That was *also* yet another name for Beijing. Beijing must be a *really* good place for a Chinese capital, huh.
en.wikipedia.org/wiki/Zhongdu (ไธญ้ฝ)
en.wikipedia.org/wiki/Shangdu (ไธ้ฝ)
en.wikipedia.org/wiki/Xiadu (ไธ้ฝ)