骊姬之乱

lí jī zhī luàn

Li Ji Rebellion in 657-651 BC, where concubine Li Ji tried to throne her son but was eventually defeated by Duke Wen of Jin 晉文公|晋文公[Jin4 Wen2 gong1]

black horse

family name of the royal family of the Zhou Dynasty 周代[Zhou1 dai4] (1046–256 BC)

zhī

(possessive particle, literary equivalent of 的[de5])

luàn

in confusion or disorder