The Founding of The Ying Dynasty
Yalishanda, starting in 237 BC, sought to complete his conquest of the Zhou dynasty by defeating the remaining nominal vassal of Zhou, the southern state of Chu. By far the most powerful of the Warring States, Chu had been preparing for the invasion since Yalishanda had begun, 7 years prior. Its defenses had been bolstered all along its border, with impressive fortifications bolstering the impressive natural barrier that was the River Yangtze, protecting the southern of Chu.
Preparing for the invasion, Yalishanda formally deposed the final sovereign of Zhou, Han Wang, and declared a new dynasty, the Ying (鷹) Dynasty, so named after the hawk that symbolized his ancestry. He established his capital at the traditional site of Chengzhou, and held within his control all the formal regalia and insignia of a ruling sovereign of the realm. From this point, he began his assaults on the southern state.
However, the Chu proved far more resilient than their northern neighbors had been. They had certainly been bolstered by refugees of the fallen states, in particular, several leading generals, as well as even entire divisions of the former armies. This was not to say that all chose to flee to the Chu rather than serve under the new regime in the north, but that the number was not insignificant. Further, as the Chu had been prepared for the invasion, they were able to bleed the Ying forces in battle after battle, utilizing the strength of the terrain to their utmost advantage.
Chu continued to prove too large an opponent for Yalishanda's previously unblemished military record, and, after 2 years of inconclusive progress, his support began to diminish in the territories under his control. Revolts broke out across the land, and the next 2 years were spent in crushing those revolts while fending off counter-invasions by Chu, as the southern state sought to capitalize on the opportunity. From 233 BC onward, the relations between Ying and Chu would be marked by nothing so much as a military stalemate.
The time was not entirely marked by war, as philosophy and art flourished under Ying rule. Chu, in its efforts to maintain its borders against the superior numbers and wealth of Ying turned its land more and more towards the Legalist philosophy that had so dominated the former state of Qin. Ying, not constrained by a need to entirely militarize its society, became a patron of all the schools of philosophy in the land, including Legalism, Confucianism, Daoism, Mohism, as well as the countless minor schools. This served not only to attract philosophers to the north, but also to embed in society greater differences among the conquered population than among the conqueror.
The infrastructure of both the Ying in the north and the Chu in the south also saw great improvements, as both states continued to build up their fortifications, as well as the roads and canals within their territories. The economies of both states also blossomed, as the northern states were now under Ying rule and had a unified system of commerce stretching all the way to central Asia. The south also benefited, as despite the belligerency between the two realms, trade never stopped.
Thus, while Yalishanda had begun his life seeking to conquer the world or at least the entirety of the former Zhou state, he spend the last decades bogged down by the administration of his vast realm. He would live on until 221 BC, dying at age 62, never having been able to see his dream to completion.