What does Arcoscephale mean?

[BesucherXia]

Hmm... I have never checked the era names before.
It sounds logical now.
The emperor of Tien Chi had given his eunuchs too much power, who were responsible for the corruption of Ming dynasty and the "invasion of barbarians".

For the original meaning of this era name, it could be translated into something like "revealed by heaven".

(Technically speaking, Chinese Pinyin-language has too many homonyms, which leads to confusion even for Chinese themselves.)