During the 6th century, Roman Emperor Justinian I launched a military campaign in Constantinople to reclaim the western provinces from the Germans, starting with North Africa and proceeding to Italy.
Though he was temporarily successful in recapturing much of the western Mediterranean he destroyed the urban centers and permanently ruined the economies in much of the West.
In the coming centuries the Western Church, as virtually the only surviving Roman institution in the West, became the only remaining link to Greek culture and civilization.
Prior to the Second Council of Constantinople was a prolonged controversy over the treatment of three subjects, all considered sympathetic to Nestorianism, the heresy that there are two separate persons in the Incarnation of Christ.
[3] Eastern patriarchs supported the emperor, but in the West his interference was resented, and Pope Vigilius resisted his edict on the grounds that it opposed the Chalcedonian decrees.
This move was instigated by Emperor Justinian in an effort to conciliate the monophysite Christians, it was opposed in the West, and the popes' acceptance of the council caused a major schism.
[4] The council interpreted the decrees of Chalcedon and further explained the relationship of the two natures of Jesus; it also condemned the teachings of Origen on the pre-existence of the soul, and Apocatastasis.
[2] The council was not immediately recognized as ecumenical in the West, and the churches of Milan and Aquileia even broke off communion with Rome over this issue.
When the Western Roman Empire fragmented under the impact of various 'barbarian' invasions, the Empire-wide intellectual culture that had underpinned late Patristic theology had its interconnections cut.
[6] Monasteries became major conduits of civilization, preserving craft and artistic skills while maintaining intellectual culture within their schools, scriptoria and libraries.
[8] Pope Gregory I played a notable role in these conversions and dramatically reformed the ecclesiastical structures and administration which then launched renewed missionary efforts.
After Childebert's death Columbanus traveled east to Metz, where Theudebert II allowed him to establish a new monastery among the semi-pagan Alemanni in what is now Switzerland.
There King Agilulf and his wife Theodolinda granted Columbanus land in the mountains between Genoa and Milan, where he established the monastery of Bobbio.
Patrick had been captured into slavery in Ireland, and following his escape and later consecration as bishop, he returned to the isle to bring them the Gospel.
[10] This essentially meant that a monk would leave the monastery and his Christian country to proselytize among the heathens, as self-chosen punishment for his sins.
Liuvigild conquered the Suevi kingdom, and in the south he took the city of Merida, in Lusitania, away from the Catholic bishop and demanded that his trinity-believing subjects convert to the branch of Christianity to which the Visigoths were adhering: Arianism.
[11] The largely Christian Gallo-Roman inhabitants of Gaul (modern France) were overrun by Germanic Franks in the early 5th century.
Clovis insisted that his fellow nobles follow suit, strengthening his newly established kingdom by uniting the faith of the rulers with that of the ruled.
Before a battle, a pagan military leader might pray to Jesus for victory, instead of Odin, if he expected more help from the Christian God.
Cosmas Indicopleustes, navigator and geographer of the 6th century, wrote about Christians, bishops, monks, and martyrs in Yemen and among the Himyarites.
The ancient territory of the Tibetans stretched farther west and north than the present-day Tibet, and they had many links with the Turkic and Mongolian tribes of Central Asia.