Old hermit of legend who, as 史记 tells it, made the young 张良 fetch a shoe he had dropped off a bridge, then gave him a book of military strategy. The 三略 is ascribed to him.
Huángshígōng chuánshuō bǎ bīng shū 《 Sù shū 》 chuán gěi le Zhāng Liáng.
Legend has it that Huang Shigong passed the military treatise Sushu to Zhang Liang.
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The idiom 孺子可教, 'the lad can be taught', is his verdict after the shoe test. His name means 'Lord Yellow Stone': he said a yellow stone at the foot of Mount Gucheng would be him, and Zhang Liang later found it, worshipped it and was buried with it.