 li chÃ©ngqiÃ¡n (ææ¿ä¹¾) (618however, this date does not reconcile well with historical records also stating that his younger brother li tai was 34 when he died in 652 -- which would make li tai born in 618. as li tai was clearly younger and born of the same mother as li chengqian, the dates cannot be both correct, but it is not clear which, if either, date was correct. further, given that li chengqian was emperor taizong's first-born son and li tai was the fourth-born son, they could not be twins. according to li tai's grave epitaph, li tai was actually born in 620. â january 5, 645å©åå¹´ä¸­è¥¿æè½æ), courtesy name gaoming (é«æ), formally prince min of hengshan (æå±±æç), was a crown prince of the chinese tang dynasty. he was emperor taizong's oldest son and first crown prince, but was replaced later by his younger brother li zhi (the eventual emperor gaozong). li chengqian was created crown prince in 627 at the age of eight, after his father became emperor in 626. in his youth, he had a reputation for good judgment, but was also said to be suffering from a foot illness. later on, he was said to be frivolous, favoring tujue customs instead of studying about ways to rule an empire. he lost favor in emperor taizong's eyes to a younger brother, li tai the prince of wei. (both were born of emperor taizong's wife empress zhangsun.) in 643, in fear that emperor taizong was about to depose him in favor of li tai, he plotted with the general hou junji to overthrow emperor taizong. the plot was discovered, and he was deposed and reduced to commoner rank, but emperor taizong, believing that li tai to be responsible for li chengqian's downfall, created yet another son, li zhi (also by empress zhangsun), crown prince instead. li chengqian was exiled, and died in exile in 644, as a commoner under house arrest. he was posthumously granted an imperial prince title during the reign of his grandnephew, emperor xuanzong after his grandson li shizhi became chancellor. == early life == li chengqian was born in 619, not long after his grandfather emperor gaozu established tang dynasty in 618. he was the first son of emperor gaozu's son li shimin the prince of qin and li shimin's wife [[empress zhangsun|princess 
619_births 645_deaths Tang_dynasty_imperial_princes