Following the Apostolic Age, there was fierce and often politicized debate in the early church on many interrelated issues. Christology was a major focus of these debates, and was addressed at every one of the first seven ecumenical councils. The second through fourth of these councils are generally entitled “Christological councils,” with the latter three mainly elucidating what was taught in them and condemning incorrect interpretations. The Council of Chalcedon in 451 issued a formulation of the being of Christ — that of two natures, one human and one divine, “united with neither confusion nor division.” This is called the doctrine of the hypostatic union, which is still held today amongst most Protestant, Catholic, and Eastern OrthodoxChristians, referred to as Chalcedonian Christianity. Due to politically charged differences in the 4th century, schisms developed, and the first denominations (from the Latin, “to take a new name”) formed.
In the 13th century, Saint Thomas Aquinas provided the first systematic Christology that consistently resolved a number of the existing issues. In his Christology from above, Aquinas also championed the principle of perfection of Christ‘s human attributes. The Middle Ages also witnessed the emergence of the “tender image of Jesus” as a friend and a living source of love and comfort, rather than just the Kyrios image. According to Catholic theologian Karl Rahner, the purpose of modern Christology is to formulate the Christian belief that “God became man and that God-made-man is the individual Jesus Christ” in a manner that this statement can be understood consistently, without the confusions of past debates and mythologies
Taken from Wikipedia: Christology