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His proposal was adopted and implemented with a treaty in 198 BC, following the two years prior.
She held power, in one guise or another, for more than half a century, first as consort of the ineffectual , then as the power behind the throne held by her youngest son, and finally from 690 until shortly before her death in 705 as monarch.
Wu she is always known by her surname has every claim to be considered a great empress.