Southern Song official, son of the general 韩世忠, who as prefect of Wenzhou wrote 《橘录》 (1178), the earliest known book devoted to citrus, describing 27 kinds of oranges grown there.
Hán Yànzhí suǒ xiě de 《 Júlù 》 shì shìjiè shàng zuì zǎo de gānjú zhuānzhù.
Han Yanzhi's Treatise on Oranges is the earliest known monograph on citrus in the world.
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He sorted his 27 kinds into three groups whose names Chinese still uses: 柑, 橘 and 橙. Japan still calls the satsuma 温州みかん (unshū mikan), 'Wenzhou mandarin', after the region he wrote about.