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HISTORY
Sima Dezong was the oldest son of Emperor Xiaowu, born of his concubine Consort Chen Guinü in 382. It is not known when Sima Dezong's developmental disability became known, but it was likely very early in his childhood, for the degree of his disability, according to historians, was great. When he was just seven years old, in 390, his mother died. Even though he had a younger brother, Sima Dewen, born of Consort Chen as well , who was described to be intelligent and careful, and who learned to take care of him throughout the years, for reasons unknown, Emperor Xiaowu appeared to have never seriously considered making Sima Dewen his heir; in 16 September 387,[3] Sima Dezong was created crown prince. In 395, he was set up in his own residence, the eastern palace, as was customary for crown princes. In 396, he married the daughter of the official Wang Xianzhi, Wang Shen'ai, as his crown princess. <
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