He also suffered an attack by Tardu Khan on his capital.
This ruler made a vow of monogamy to his wife, which he only broke by obtaining two concubines after her death. He abstained from meat for a year during a famine in honor of his citizens, and during his time as regent, he foiled an assassination attempt by Yuwen Yun. His advisor Gao Jiong suggested that he withdraw against the state of Emperor Xuan after Xuan's death, and helped lead his later campaign against the Chen. He sent his son Yang Liang to command forces against the Gogoryeo kingdom when it attacked Ying Province. He also suffered an attack by Tardu Khan on his capital. He commissioned the Renshu palace near the end of his reign, and his son, the future Emperor Yang, would continue the Grand Canal project that he began. For 10 points, name this first emperor of the Sui Dynasty.
This ruler made a vow of monogamy to his wife, which he only broke by obtaining two concubines after her death.
Emperor Wen of Sui or Wen-di or Yang Jian