Emperor Yang, also known as Yang Guang, is remembered as a fearsome and decadent tyrant. During his rule from 606 until his death at the hands of rebels in 618, he forced millions of laborers to take part in ambitious construction projects, such as building royal palaces, completing of the Grand Canal and reconstructing of the Great Wall. Emperor Yang also launched costly military campaigns, including a failed conquest of Goguryeo, an ancient kingdom of Korea, which eventually led to the collapse of the Sui Dynasty.