Why does Lu Yuan harbor such hate for Zheng Kingdom?
The reason lies right here.
Initially, Tang Kingdom made exorbitant demands, aiming to swallow up three counties in the eastern part of Liang at once, almost hitting Liang's vital weakness, nearly knocking it to the ground.
Why say so?
First, let's see how much territory Liang actually has now.
After the Northern Expedition of Chu, Liang lost half of Guangling County, one Jiangxia County, one Xingyang County, one East Sea County, and one Jiying County—a total of four and a half counties' worth of land gone in one fell swoop.
Since then, the east of Qing no longer belonged to Liang.
Then, in the central part of Qingzhou, to the north, Xu State seized Dongping County, and Chu's eastern military expedition advanced into Chengyang County and Rencheng Prefecture.
In these two counties, each occupied more than half of the territory, and the fighting with Liang was intense.