It is unlikely that there were many Christian communities in central China, and the only inland Chinese city south of the Yellow River where a Nestorian presence can be confirmed in the Tang dynasty is Chengdu. And two monasteries have been located in Chengdu and Omei Shan, both in Sichuan. Shortly afterwards Thomas of Marga mentions the monk David of Beth ʿAbe, who was metropolitan of Beth Sinaye during the reign of Timothy I (780–823). Timothy I is said also to have consecrated a metropolitan for Tibet (Beth Tuptaye), a province not again mentioned.