What is known today as the Greek Orthodox Church began to break away from the Catholic Church in the year 1054, and was officially established in 1204. The separation of the western Catholic church and eastern orthodox church is known as The Great Schism.
Nearly a thousand years after the Christian church was founded in Rome, the religion spread to Europe and parts of Asia. During the 10th century, the eastern and western leaders of the church began to disagree about the content of Christian doctrine and Christian beliefs. The break from one Christian church into two churches took place over a period of around 200 years, and the sacking of the city Constantinople in the year 1204 is seen by many as the definitive time that the Greek Orthodox Church formed.