Following Sun Quan's death and the ascension of the young Sun Liang to the throne in 252, the state of Wu went into steady decline. Successful Wei suppression of rebellions in the southern Huai River region by Sima Zhao and Sima Shi reduced any opportunity of Wu influence. The fall of Shu signalled a change in Wei politics. After Liu Shan surrendered to Wei, Sima Yan (grandson of Sima Yi), overthrew the Wei emperor and proclaimed his own dynasty of Jin in 266, ending 46 years of Cao dominion in the north. After Jin's rise, emperor Sun Xiu of Wu died, and his ministers gave the throne to Sun Hao. Sun Hao was a promising young man, but upon ascension he became a tyrant, killing or exiling all who dared oppose him in the court. In 269 Yang Hu, a Jin commander in the south, started preparing for the invasion of Wu by ordering the construction of a fleet and the training of marines in Sichuan under Wang Jun. Four years later, Lu Kang, the last great general of Wu, died leaving no competent successor. The planned Jin offensive finally came at the end of 279. Sima Yan launched five simultaneous offensives along the Yangtze River from Jianye (present-day Nanjing) to Jiangling while the Sichuan fleet sailed downriver to Jing Province. Under the strain of such an enormous attack, the Wu forces collapsed and Jianye fell in the third month of 280. Sun Hao surrendered and was given a fiefdom on which to live out his days. This marked the end of the Three Kingdoms era, and the beginning of a break in the forthcoming 300 years of disunity.