宋国 / Song State
宋国 / Song State enters the wiki through 《资治通鉴·周纪》07丨两起刺杀（2）, where the episode pauses during the 宋悼公 to 宋休公 succession notice to explain why Song was special among pre-Qin states. The source says Song preserved the Shang lineage through 微子启 and received high ritual status under Zhou rule.
The page’s wiki role is not a full institutional history. It anchors Shang-Remnant State Legitimacy / 商裔封国合法性, the idea that a conquered dynasty’s surviving lineage can be incorporated into the new order as a ritually honored guest rather than being eliminated.
The episode also uses Song to connect later classical authority back to lineage: 孔子 is said to descend from Song nobility through 孔父嘉.