Tang dynasty master of wild cursive script, 狂草, said to write while drunk, even with his hair dipped in ink. 杜甫 named him one of the Eight Immortals of the Wine Cup.
People called Zhang Xu the 'Sage of Cursive Script'.
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Later ages called him 草圣, 'the sage of cursive', and paired him with the monk 怀素, who also wrote after drinking, in the phrase 颠张醉素, 'mad Zhang, drunk Su'.