The terms "Western" and "Eastern" in this regard originated with geographical divisions mirroring the cultural divide between the Hellenistic East and Latin West and the political divide between the Western and Eastern Roman empires.
The earliest concept of Europe as a cultural sphere (instead of simply a geographic term) appeared during the Carolingian Renaissance of the 9th century, which included territories that practiced Western Christianity at the time.
Cultural differences and political rivalry created tensions between the two churches, leading to disagreement over doctrine and ecclesiology and ultimately to schism.
[12] There is evidence of a Latin translation of the Bible as early as the 2nd century (see also Vetus Latina).
With the decline of the Roman Empire, distinctions appeared also in organization, since the bishops in the West were not dependent on the Emperor in Constantinople and did not come under the influence of the Caesaropapism in the Eastern Church.
Formulated in the legislation of the emperor Justinian I (527–565), especially in his Novella 131, the theory received formal ecclesiastical sanction at the Council in Trullo (692), which ranked the five sees as Rome, Constantinople, Alexandria, Antioch, and Jerusalem.
Historian Paul Legutko of Stanford University said the Catholic Church is "at the center of the development of the values, ideas, science, laws, and institutions which constitute what we call Western civilization".
[14] The rise of Protestantism led to major divisions within Western Christianity, which still persist, and wars—for example, the Anglo-Spanish War of 1585–1604 had religious as well as economic causes.
Today, the geographical distinction between Western and Eastern Christianity is much less absolute, due to the great migrations of Europeans across the globe, as well as the work of missionaries worldwide over the past five centuries.
[20] Most Western Christians use a version of the Nicene Creed that states that the Holy Spirit "proceeds from the Father and the Son", where the original text as adopted by the First Council of Constantinople had "proceeds from the Father" without the addition of either "and the Son" or "alone".