Chen , which ruled the south , was weak compared to Sui and its ruler was incompetent and pleasure - loving .
One of Yang Jian ( or Sui Wen Ti ) 's first priorities was the reunification of China .
Chen , which ruled the south , was weak compared to Sui and China 's ruler was incompetent and pleasure - loving .
One of Yang Jian ( or Sui Wen Ti ) 's first priorities was the reunification of China .