War with Southern Qi In 479, Xiao Daocheng usurped the throne of Liu Song and became emperor of the new Southern Qi dynasty. Upon hearing the news, the Northern Wei emperor prepared to invade under the pretext of installing Liu Chang, son of Emperor Wen of Song who had been in exile in Wei since 465 AD.
War with Southern Qi In 479 Xiao Daocheng usurped the throne of Liu Song and became emperor of the new Southern Qi dynasty Upon hearing the news the Northern Wei emperor prepared to invade under the pretext of installing Liu Chang son of Emperor Wen of Song who had been in exile in Wei since 465 AD