Christendom

Christendom or the Christian world are terms commonly used to refer to the global Christian community, Christian states, Christian-majority countries or countries in which Christianity is dominant or prevails.
Following the spread of Christianity from the Levant to Europe and North Africa during the early Roman Empire, Christendom has been divided in the pre-existing Greek East and Latin West. After the Great schism of 1054, two main branches within Christianity emerged, centred around the cities of Rome and Constantinople. After the fall of Constantinople in 1453, Latin Christendom rose to a central role in the Western world. Following the reformation, protestantism emerged as the third main branch of Christianity in the 16th century. The history of the Christian world spans about 2,000 years and includes a variety of socio-political developments, as well as advancements in the arts, architecture, literature, science, philosophy, politics and technology.

Terminology

The Anglo-Saxon term crīstendōm appears to have been coined in the 9th century by a scribe somewhere in southern England, possibly at the court of king Alfred the Great of Wessex. The scribe was translating Paulus Orosius' book History Against the Pagans and in need for a term to express the concept of the universal culture focused on Jesus Christ. It had the sense now taken by Christianity.
The current sense of the word of "lands where Christianity is the dominant religion" emerged in Late Middle English.
Canadian theology professor Douglas John Hall stated that "Christendom" means literally the dominion or sovereignty of the Christian religion." Thomas John Curry, Roman Catholic auxiliary bishop of Los Angeles, defined Christendom as "the system dating from the fourth century by which governments upheld and promoted Christianity." Curry states that the end of Christendom came about because modern governments refused to "uphold the teachings, customs, ethos, and practice of Christianity." British church historian Diarmaid MacCulloch described Christendom as "the union between Christianity and secular power."
There is a common and nonliteral sense of the word that is much like the terms Western world, known world or Free World. The notion of "Europe" and the "Western World" has been intimately connected with the concept of "Christianity and Christendom"; many even attribute Christianity for being the link that created a unified European identity.

History

Rise of Christendom

Early Christianity spread in the Greek/Roman world and beyond as a 1st-century Jewish sect, which historians refer to as Jewish Christianity. It may be divided into two distinct phases: the apostolic period, when the first apostles were alive and organizing the Church, and the post-apostolic period, when an early episcopal structure developed, whereby bishoprics were governed by bishops.
The post-apostolic period concerns the time roughly after the death of the apostles when bishops emerged as overseers of urban Christian populations. The earliest recorded use of the terms Christianity and catholic, dates to this period, the 2nd century, attributed to Ignatius of Antioch c. 107. Early Christendom would close at the end of imperial persecution of Christians after the ascension of Constantine the Great and the Edict of Milan in AD 313 and the First Council of Nicaea in 325.
According to Malcolm Muggeridge, Christ founded Christianity, but Constantine founded Christendom. Canadian theology professor Douglas John Hall dates the 'inauguration of Christendom' to the 4th century, with Constantine playing the primary role and Theodosius I and Justinian I secondary roles.

Late Antiquity and Early Middle Ages

"Christendom" has referred to the medieval and renaissance notion of the Christian world as a polity. In essence, the earliest vision of Christendom was a vision of a Christian theocracy, a government founded upon and upholding Christian values, whose institutions are spread through and over with Christian doctrine. In this period, members of the Christian clergy wield political authority. The specific relationship between the political leaders and the clergy varied but, in theory, the national and political divisions were at times subsumed under the leadership of the church as an institution. This model of church-state relations was accepted by various Church leaders and political leaders in European history.
The Church gradually became a defining institution of the Roman Empire. Emperor Constantine issued the Edict of Milan in 313 proclaiming toleration for the Christian religion, and convoked the First Council of Nicaea in 325 whose Nicene Creed included belief in "one holy catholic and apostolic Church". Emperor Theodosius I made Nicene Christianity the state church of the Roman Empire with the Edict of Thessalonica of 380. In terms of prosperity and cultural life, the Byzantine Empire was one of the peaks in Christian history and Christian civilization, and Constantinople remained the leading city of the Christian world in size, wealth, and culture. There was a renewed interest in classical Greek philosophy, as well as an increase in literary output in vernacular Greek.
As the Western Roman Empire disintegrated into feudal kingdoms and principalities, the concept of Christendom changed as the western church became one of five patriarchates of the Pentarchy and the Christians of the Eastern Roman Empire developed. The Byzantine Empire was the last bastion of Christendom. Christendom would take a turn with the rise of the Franks, a Germanic tribe who converted to the Christian faith and entered into communion with Rome.
On Christmas Day 800 AD, Pope Leo III crowned Charlemagne, resulting in the creation of another Christian king beside the Christian emperor in the Byzantine state. The Carolingian Empire created a definition of Christendom in juxtaposition with the Byzantine Empire, that of a distributed versus centralized culture respectively.
The classical heritage flourished throughout the Middle Ages in both the Byzantine Greek East and the Latin West. In the Greek philosopher Plato's ideal state there are three major classes, which was representative of the idea of the "tripartite soul", which is expressive of three functions or capacities of the human soul: "reason", "the spirited element", and "appetites". Will Durant made a convincing case that certain prominent features of Plato's ideal community where discernible in the organization, dogma and effectiveness of "the" Medieval Church in Europe:

... For a thousand years Europe was ruled by an order of guardians considerably like that which was visioned by our philosopher. During the Middle Ages it was customary to classify the population of Christendom into laboratores, bellatores, and oratores. The last group, though small in number, monopolized the instruments and opportunities of culture, and ruled with almost unlimited sway half of the most powerful continent on the globe. The clergy, like Plato's guardians, were placed in authority... by their talent as shown in ecclesiastical studies and administration, by their disposition to a life of meditation and simplicity, and... by the influence of their relatives with the powers of state and church. In the latter half of the period in which they ruled , the clergy were as free from family cares as even Plato could desire ... Celibacy was part of the psychological structure of the power of the clergy; for on the one hand they were unimpeded by the narrowing egoism of the family, and on the other their apparent superiority to the call of the flesh added to the awe in which lay sinners held them....

Later Middle Ages and Renaissance

After the collapse of Charlemagne's empire, the southern remnants of the Holy Roman Empire became a collection of states loosely connected to the Holy See of Rome. Tensions between Pope Innocent III and secular rulers ran high, as the pontiff exerted control over their temporal counterparts in the west and vice versa. The pontificate of Innocent III is considered the height of temporal power of the papacy. The Corpus Christianum described the then-current notion of the community of all Christians united under the Roman Catholic Church. The community was to be guided by Christian values in its politics, economics and social life. Its legal basis was the corpus iuris canonica.
In the East, Christendom became more defined as the Byzantine Empire's gradual loss of territory to an expanding Islam and the Muslim conquest of Persia. This caused Christianity to become important to the Byzantine identity. Before the East–West Schism which divided the Church religiously, there had been the notion of a universal Christendom that included the East and the West. After the East–West Schism, hopes of regaining religious unity with the West were ended by the Fourth Crusade, when Crusaders conquered the Byzantine capital of Constantinople and hastened the decline of the Byzantine Empire on the path to its destruction. With the breakup of the Byzantine Empire into individual nations with nationalist Orthodox Churches, the term Christendom described Western Europe, Catholicism, Orthodox Byzantines, and other Eastern rites of the Church.
The Catholic Church's peak of authority over all European Christians and their common endeavours of the Christian community—for example, the Crusades, the fight against the Moors in the Iberian Peninsula and against the Ottomans in the Balkans—helped to develop a sense of communal identity against the obstacle of Europe's deep political divisions. The popes, formally just the bishops of Rome, claimed to be the focus of all Christendom, which was largely recognised in Western Christendom from the 11th century until the Reformation, but not in Eastern Christendom. Moreover, this authority was also sometimes abused, and fostered the Inquisition and anti-Jewish pogroms, to root out divergent elements and create a religiously uniform community. Ultimately, the Inquisition was done away with by order of Pope Innocent III.
Christendom ultimately was led into specific crisis in the late Middle Ages, when the kings of France managed to establish a French national church during the 14th century and the papacy became ever more aligned with the Holy Roman Empire of the German Nation. Known as the Western Schism, western Christendom was a split between three men, who were driven by politics rather than any real theological disagreement for simultaneously claiming to be the true pope. The Avignon Papacy developed a reputation for corruption that estranged major parts of Western Christendom. The Avignon schism was ended by the Council of Constance.
Before the modern period, Christendom was in a general crisis at the time of the Renaissance Popes because of the moral laxity of these pontiffs and their willingness to seek and rely on temporal power as secular rulers did. Many in the Catholic Church's hierarchy in the Renaissance became increasingly entangled with insatiable greed for material wealth and temporal power, which led to many reform movements, some merely wanting a moral reformation of the Church's clergy, while others repudiated the Church and separated from it in order to form new sects. The Italian Renaissance produced ideas or institutions by which men living in society could be held together in harmony. In the early 16th century, Baldassare Castiglione laid out his vision of the ideal gentleman and lady, while Machiavelli cast a jaundiced eye on "la verità effetuale delle cose"—the actual truth of things—in The Prince, composed, humanist style, chiefly of parallel ancient and modern examples of Virtù. Some Protestant movements grew up along lines of mysticism or renaissance humanism. The Catholic Church fell partly into general neglect under the Renaissance Popes, whose inability to govern the Church by showing personal example of high moral standards set the climate for what would ultimately become the Protestant Reformation. During the Renaissance, the papacy was mainly run by the wealthy families and also had strong secular interests. To safeguard Rome and the connected Papal States the popes became necessarily involved in temporal matters, even leading armies, as the great patron of arts Pope Julius II did. During these intermediate times, popes strove to make Rome the capital of Christendom while projecting it through art, architecture, and literature as the center of a Golden Age of unity, order, and peace.
Professor Frederick J. McGinness described Rome as essential in understanding the legacy the Church and its representatives encapsulated best by The Eternal City:

No other city in Europe matches Rome in its traditions, history, legacies, and influence in the Western world. Rome in the Renaissance under the papacy not only acted as guardian and transmitter of these elements stemming from the Roman Empire but also assumed the role as artificer and interpreter of its myths and meanings for the peoples of Europe from the Middle Ages to modern times... Under the patronage of the popes, whose wealth and income were exceeded only by their ambitions, the city became a cultural center for master architects, sculptors, musicians, painters, and artisans of every kind...In its myth and message, Rome had become the sacred city of the popes, the prime symbol of a triumphant Catholicism, the center of orthodox Christianity, a new Jerusalem.

It is clearly noticeable that the popes of the Italian Renaissance have been subjected by many writers with an overly harsh tone. Pope Julius II, for example, was not only an effective secular leader in military affairs, a deviously effective politician but foremost one of the greatest patron of the Renaissance period and person who also encouraged open criticism from noted humanists.
The blossoming of renaissance humanism was made very much possible due to the universality of the institutions of Catholic Church and represented by personalities such as Pope Pius II, Nicolaus Copernicus, Leon Battista Alberti, Desiderius Erasmus, sir Thomas More, Bartolomé de Las Casas, Leonardo da Vinci and Teresa of Ávila. George Santayana in his work The Life of Reason postulated the tenets of the all encompassing order the Church had brought and as the repository of the legacy of classical antiquity:

The enterprise of individuals or of small aristocratic bodies has meantime sown the world which we call civilised with some seeds and nuclei of order. There are scattered about a variety of churches, industries, academies, and governments. But the universal order once dreamt of and nominally almost established, the empire of universal peace, all-permeating rational art, and philosophical worship, is mentioned no more. An unformulated conception, the prerational ethics of private privilege and national unity, fills the background of men's minds. It represents feudal traditions rather than the tendency really involved in contemporary industry, science, or philanthropy. Those dark ages, from which our political practice is derived, had a political theory which we should do well to study; for their theory about a universal empire and a Catholic church was in turn the echo of a former age of reason, when a few men conscious of ruling the world had for a moment sought to survey it as a whole and to rule it justly.