西周国 / Western Zhou Polity

西周国 / Western Zhou polity appears in 《资治通鉴·周纪》16丨孙膑庞涓恩怨纠葛 桂陵之战 as the counterpart to 东周国 after the diminished 周王室 domain splits internally. The source mentions it to explain why a 353 BCE attack on “东周” refers to a small Zhou polity rather than the entire Eastern Zhou era.

Its wiki role is contextual. The episode’s main action lies with 齐国, 魏国, and 赵国, but the East-West Zhou split shows the same Warring States pressure from another angle: the royal house still structures the chronology while its own practical territory has become narrow and divided.

Connections

• 周王室 - royal frame.
• 东周国 and Eastern-Western Zhou Split / 东周西周分裂 - paired polity and split pattern.
• 韩国 - state whose attack on Eastern Zhou makes the split relevant in the source.
• 周显王 and 战国时期 - annalistic and period context.