Old Book of Tang: Wu Zetian was given the honorific title Divine Sage Emperor, and Emperor Ruizong was lowered to Huangsi (the Zhou was founded)…
Wu Zetian was given the honorific title Divine Sage Emperor, and Emperor Ruizong was lowered to Huangsi (the Zhou was founded).
乙酉，加尊號曰聖神皇帝，降皇帝為皇嗣。
Location: 舊唐書 卷6 天授1年 9月
The state name was changed to Zhou and she ascended the throne as Holy Divine Emperor; Ruizong was demoted to Heir Successor.
壬午，改國號周
Location: 新唐書 卷004 則天·中宗 天授1年9月
Place: 洛陽
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