沧海君 / Canghai Jun
沧海君 / Canghai Jun enters the wiki through 《资治通鉴·秦纪》123-1｜神之预言：“亡秦者胡”竟是指…？ as the eastern contact through whom 张良 finds the strongman used in the 博浪沙 attack on 嬴政 / 秦始皇. The episode keeps his identity uncertain and mentions a later scholarly possibility that he may have been an outside-Qin leader associated with the Canghai commandery name used in 司马迁’s era.
The page is intentionally narrow. Canghai Jun’s source function is to mark the non-Qin or far-eastern channel through which Zhang Liang’s assassination resources become plausible, especially the heavy iron hammer detail that raises questions after Qin’s earlier post-conquest disarmament.