Yu Wenyun and Yu Wenyong, two figures who left important marks in Chinese history, had a close and complex relationship.

Yu Wenyun, styled Gongdu, was the eldest son of Emperor Wen of the Northern Zhou Dynasty, Yu Wentai. His life was full of twists and turns. His mother was the daughter of Du Gu Xin, which gave him a prominent status in the Northern Zhou Dynasty. However, his career was not smooth. He was once deposed as a commoner and later reinstated as the crown prince. However, his position as crown prince did not last long, as his younger brother, Yu Wenyong, usurped the throne in 572 AD to become the new emperor of the Northern Zhou Dynasty.

Yu Wenyong, styled Gongqing, was the fourth son of Emperor Wen of the Northern Zhou Dynasty, Yu Wentai. He usurped the throne in 572 AD to become the new emperor of the Northern Zhou Dynasty, known as Emperor Wu of the Northern Zhou. During his reign, he implemented a series of reforms that greatly enhanced the national strength of the Northern Zhou Dynasty. Under his rule, the territory of the Northern Zhou expanded to most of the Yellow River basin, becoming one of the most powerful regimes in China at that time.

During his reign, Yu Wenyong held various important positions. He was initially appointed as the King of Qin, later as the King of Qi, and finally as emperor. He appointed a number of talented individuals such as Yang Jian and Li Delin, who played important roles under his rule.

Overall, Yu Wenyun and Yu Wenyong were brothers, but their relationship was not harmonious. Although Yu Wenyun was once the crown prince of the Northern Zhou Dynasty, his position did not last long. Yu Wenyong, on the other hand, usurped the throne to become the new emperor of the Northern Zhou Dynasty. Their roles and statuses in history reflect the complexity and contradictions of that era.

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