Harald Bluetooth vs Yang Guang

Harald Bluetooth unified the Danish tribes into a single kingdom, consolidating power over Jutland, Zealand, and surrounding islands. This unification laid the foundation for the medieval Danish state and established the Gorm dynasty's rule.

Harald Bluetooth converted to Christianity and mandated the conversion of Denmark. He erected the larger Jelling rune stone, which proclaims that he 'made the Danes Christian'. This event marked Denmark's entry into Christian Europe and aligned it with Latin Christendom.

Harald Bluetooth commissioned the Jelling rune stones and burial mounds in memory of his parents. The larger stone, often called 'Denmark's birth certificate', features a depiction of Christ and a runic inscription celebrating his unification of Denmark and Norway.

Harald Bluetooth conquered Norway after defeating Earl Hakon Sigurdsson, bringing Norway under Danish rule. This expansion created a short-lived North Sea empire and demonstrated Danish military power in Scandinavia.

Harald Bluetooth faced a rebellion led by his son Sweyn Forkbeard, who opposed his father's rule and Christianization policies. The rebellion forced Harald into exile, where he died shortly after, ending his reign and leading to Sweyn's ascension.

Emperor Yang Guang ordered the construction of the Grand Canal, linking the Yellow River and Yangtze River. The project mobilized millions of laborers and created a vital waterway for grain transport and trade, but the immense human cost led to widespread resentment and rebellion.

Yang Guang launched three massive military campaigns against the Korean kingdom of Goguryeo. The first invasion in 612 ended in catastrophic defeat at the Battle of Salsu, with hundreds of thousands of Chinese soldiers killed. The repeated failures drained the treasury and sparked widespread revolts.

While Yang Guang was campaigning against Goguryeo, the noble Yang Xuangan launched a major rebellion in the rear. The revolt was suppressed, but it exposed the fragility of Sui rule and encouraged further uprisings across the empire.

As rebellions engulfed the empire, Yang Guang was strangled to death in Jiangdu by his own guards led by Yuwen Huaji. His death marked the effective end of the Sui dynasty, which collapsed shortly after, leading to the rise of the Tang dynasty.