Dù Zǐwēi 杜子微
Legendary Daoist longevity adept of the late Hàn period, cited in the Yàolù 藥錄 (KR3e0108) and the Bàopǔzǐ nèipiān 抱朴子內篇 (KR5f0019) — Gě Hóng’s 葛洪 葛洪 section on immortality drugs (《仙藥》) — as the principal witness for the use of tiānméndōng 天門冬 (asparagus root) as an immortality drug. In the surviving anecdotal tradition, Dù Zǐwēi is said to have lived to extreme old age, retained sexual potency with eighteen (in the Yàolù) or eighty (in the Bàopǔzǐ) consorts, fathered some 140 children, and walked three hundred lǐ a day, attributing all these accomplishments to his regimen of tiānméndōng. Modern scholarship treats Dù Zǐwēi as a legendary fāngshì 方士 / xiānrén 仙人 figure of the late Hàn / early xuányán 玄言 culture rather than a historical person.