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The Second Council of Nicaea was the seventh ecumenical council of Christianity; it met in 787 AD in Nicaea (site of the First Council of Nicaea) to restore the honoring of icons (or, holy images), which had been suppressed by imperial edict inside the Byzantine Empire during the reign of Leo III (717 - 741).
In 786, the council met in the Church of the Apostles in Constantinople.
Careful maintenance of the ordinances of the earlier councils, knowledge of the scriptures on the part of the clergy, and care for Christian conduct are required, and the desire for a renewal of ecclesiastical life is awakened.
The purpose of the council (also called a synod) was to resolve disagreements in the church of Alexandria over the nature of the Trinity: in particular whether Jesus was of the same or of similar substance as God the Father.
The first Council of Nicaea was the first general gathering of bishops from the whole Church, to resolve differences of faith that had arisen and to define clearly the faith received from the apostles.
The council was formally opened May 20, in the central structure of the imperial palace, with preliminary discussions on the Arian question.