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Decisions: Restored the veneration of icons after the period of iconoclasm, defined the terms for the proper use and honor of icons. Impact: Affected the liturgical and devotional practices of the church and was a key factor in the permanent split between the Eastern and Western churches.

Decisions: Declared the Virgin Mary as Theotokos (God-bearer), condemned Nestorianism. Impact: Affirmed the unity of divine and human natures in Jesus Christ and promoted veneration of Mary.

Decisions: Modified the Nicene Creed into its current form, reaffirmed the divinity of the Holy Spirit. Impact: Further defined the concept of the Trinity and confirmed the equality of the Holy Spirit with the Father and the Son.

Decisions: Establishment of the Nicene Creed, defining the nature of the relationship between God the Father and Jesus the Son. Impact: Solidified the doctrine of the Trinity in Christianity, addressing the Arian controversy.

Decisions: Confirmed the previous four ecumenical councils, condemned Origenism and affirmed the Christological declarations made at Chalcedon. Impact: Consolidated doctrinal positions against various heresies and reinforced the authority of prior ecumenical councils.

Decisions: Defined the two natures of Jesus Christ in the Chalcedonian Definition, recognized the full divinity and humanity of Christ. Impact: Rejected Monophysitism and influenced the schism between the Chalcedonian and Non-Chalcedonian churches.