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In page Empress Xiaoyiren:

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On 18 March 1678, the Kangxi Emperor's second empress consort, Empress Xiaozhaoren, died so there was no one to take charge of the emperor's harem. The Noble Consort was put in charge and became the de facto chief of imperial harem. On 13 December 1678, another concubine of the Kangxi Emperor gave birth to a son, Yinzhen. Traditionally, the Empress was tasked with overseeing the upbringing of all the Emperor's children, regardless of whether or not she was their birth mother. Since the Noble Consort was the most senior among all the Kangxi Emperor's consorts at the time, she was tasked with raising Yinzhen.[citation needed]