Xǔ Jiān 許堅, a Northern-Sòng Yì-scholar appearing in the standard transmission-line of the Hé túLuò shū charts: 陳摶 Chén Tuán → 種放 Zhǒng Fàng → 李溉 Lǐ Gài → Xǔ Jiān → 范諤昌 Fàn Èchāng → 劉牧 Liú Mù. Lifedates not securely recorded.