sentences:  Empress Dowager Liu (Sui dynasty)
  
  Empress Dowager Liu (劉太后, personal name unknown), briefly further honored as Empress Dowager Shenggan (聖感皇太后, literally "the empress dowager with holy emotions"), was an empress dowager of the Chinese dynasty Sui Dynasty.She was a concubine of Yang Zhao, who was crown prince during the reign of his father Emperor Yang, and she was the mother of Yang Tong, the last person to claim the Sui throne.