It is not clear when he was born, but judging by his younger brother Li Jiong's date of birth it is speculated to be sometime between 746 and 750.

Although the consort Cui was Daizong's first wife, she lost Daizong's favor after her maternal clan was slaughtered during the Anshi Rebellion.

Li Miao was known to be a studious and virtuous person.

In 761 he was bestowed the title Prince of Yichang by his grandfather Tang Suzong.

In 762 he was bestowed the title Prince of Zheng by his father Daizong.

Li Miao died on June 11, 773.

李邈的生母崔妃是唐代宗的嫡妻，但崔氏母族在安史之亂被誅殺後，唐代宗對她恩顧漸薄。而李邈好學，以賢聞名。上元二年（761年），李邈被他祖父唐肅宗封為益昌郡王。寶應元年（762年），李邈被他父親唐代宗封為鄭王，淄青牙將李懷玉驅逐其帥侯希逸，詔李邈為平盧淄青節度大使，以李懷玉知留後。

廣德二年（764年），其異母長兄李适被立為太子。大曆初年，代太子李适為天下兵馬元帥。大曆八年（773年）五月十七日，鄭王李邈去世，唐代宗廢朝三日，于是罷除元帥之職。唐代宗惜李邈之才早夭，冊贈昭靖太子，葬在萬年縣界。兒子舒王李誼，本名李謨。以其最幼，唐德宗李适憐惜之，在父親唐代宗要求下，命為自己的孩子。另一子靈溪郡王李詠。

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