韩桓惠王 / King Huanhui of Han
韩桓惠王 / King Huanhui of Han enters the wiki through 《资治通鉴·周纪》83丨诸侯摆烂竟成了经典计中计？ as the ruler who succeeds 韩釐王 after the 华阳之战 crisis. The episode keeps the succession notice brief, but its placement matters: Han has just survived a Wei-Zhao attack only because 秦国 chose to intervene.
The episode says Han Huanhui Wang’s first major direction is to mobilize with 魏国 under the shadow of 白起’s coming attack on 楚国. That puts him inside 战国同盟转向 immediately: the same Han that had just asked Qin to rescue it now stands in a Qin-led order where Han and Wei both behave like subordinate partners.
《资治通鉴·周纪》84丨防止秦国灭楚竟用这招？ develops the risk of that posture. 黄歇 / 春申君 argues that Han and Wei look useful as Qin’s path toward 楚国, but their accumulated resentment against 秦国 makes them unsafe corridor states. In the episode’s outcome, 秦昭襄王 dismisses the Han and Wei troops after accepting Huang Xie’s advice.