Extremely short-lived (roughly ten-month) kingdom proclaimed in 928 when the Bai noble Yang Ganzhen overthrew Dachanghe's Zheng family and installed Zhao Shanzheng as ruler. Second of the three Yunnan interregnum kingdoms between Nanzhao and Dali.
Yang Ganzhen deposed and killed Zhao Shanzheng within the year (929), renamed the state Dayining, and took the throne himself.
Same verified survey fallback as dachanghe_kingdom — no dedicated monograph exists for a one-year interregnum kingdom; Yang covers the full Zheng/Zhao/Yang succession crisis.