premise: The Tomb of Wang Chuzhi (Chinese 王處直墓 / 王处直墓 Wang Chizhi mu) is the grave of Wang Chuzhi (863-923 CE), a senior military governor of the late period of the Tang Dynasty and the Later Liang from the time of the Five Dynasties. It was rediscovered in 1980 in Xiyanchuan village in Quyang district of the Chinese province of Hebei.
hypothesis: the grave of Wang Chuzhi was discovered in 1980
reason:  It was rediscovered in 1980 