大秦景教流行中国碑
The Nestorian Stele is a Tang Chinese stele erected in 781 that documents 150 years of early Christianity in China. It is a 279 cm tall limestone block with text in both Chinese and Syriac describing the existence of Christian communities in several cities in northern China. It reveals that the initial Nestorian Christian church had met recognition by the Tang Emperor Taizong, due to efforts of the Christian missionary Alopen in 635.