赵固 / Zhao Gu (Warring States)
赵固 / Zhao Gu appears in 《资治通鉴·周纪》59丨一朝君王一朝臣 as the official 赵武灵王 appoints to manage Hu affairs after Zhao’s northern advance. The episode says Zhao Wuling Wang reaches Yuzhong, receives horses from Hu chiefs, then returns to Handan and appoints Zhao Gu as Dai commandery chancellor while recruiting Hu people as fighters.
His page is source-scoped for now. Zhao Gu’s role is not developed as an independent biography; he functions as evidence that 胡服骑射 is tied to frontier administration and recruitment, not just clothing and mounted archery drills.