though from the Western view, Nestorian Christianity was considered heretical by the Latin Christians. Opposition arose to the Christians in 698–699 from the Buddhists, and then from the Daoists in 713, but Christianity continued to thrive, and in 781, a stone stele (the Nestorian Stele) was erected at the Tang capital of Chang-an, which recorded 150 years of Emperor-supported Christian history in China. The text of the stele describes flourishing communities of Christians throughout China, but beyond this and few other fragmentary records, relatively little is known of their history. In later years, other emperors were not as religiously tolerant. In 845, the Chinese authorities implemented an interdiction of foreign cults, and Christianity diminished in China until the time of the Mongol Empire in the 13th century. Christianity among the Mongols Overall, Mongols were highly tolerant of most religions, and typically sponsored several at the same time. They had been proselytized by Nestorian Christians since about the 7th century, and several Mongol tribes, such as the Kerait, Naimans, Merkit, and to a large extent the Kara Khitan (who practiced it side by side with Buddhism), were also Christian. The founder of the Mongol Empire, Genghis Khan (1162–1227) was a shamanist, but showed great tolerance to other religions. His sons were married to Christian princesses of the Kerait clan, such as Sorghaghtani Beki and Doquz Khatan, a remarkable Kerait noblewoman, the granddaughter of Toghrul Khan and a passionate Christian who held considerable influence at the court of the Khan. She made no secret of her dislike of Islam and her eagerness to help Christians of every sect. Under the rule of Genghis's grandson Möngke Khan (1205–1259), son of Sorghaghtani, the main religious influence was that of the Christians, to whom Möngke showed special favour in memory of his mother. East–West rapprochement Following the East–West Schism of 1054, various efforts, over several centuries, were made at reuniting eastern and western Christianity, with the objective of putting both under the rule of the Pope. Armenian Church In 1198, a Union was proclaimed between Rome and the Armenian Church by the Armenian catholicos of Sis, Grigor VI Apirat. This was not followed in deeds however, as the local clergy and populace was strongly opposed to such a union. Again in 1441, the Armenian Catholicos of Sis Grigor IX Musabekiants proclaimed the union of the Armenian and Latin churches at the Council of Florence, but