Please answer the following question: What type of details about zhenjin can be gathered from the following bio? Bio: zhenjin -lrb- ; 1243 -- january 5 , 1286 -rrb- , also jingim , chinkim , or chingkim -lrb- -rrb- , was the second son of kublai khan , founder of the yuan dynasty . he was designated as the crown prince -lrb- -rrb- by kublai khan in 1273 , and became the head of the central secretariat -lrb- zhongshu sheng -rrb- . the north chinese buddhist monk haiyun gave him the name zhenjin -lrb- true gold -rrb- when he was born in 1243 . he was also known as a strong supporter of confucianism . when a confucian-trained official in the south proposed that kublai abdicate in favor of zhenjin in 1285 , kublai was angered . zhenjin died on 5 january 1286 , 8 years before his father kublai khan . distressed by his death , kublai khan made zhenjin 's son temur the new crown prince , who later became the temur khan or emperor chengzong .
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