Yes, the decisions made at the First Ecumenical Council are well-documented. The First Ecumenical Council was held in Nicaea in 325 AD, and it was convened by the Roman Emperor Constantine I to address the issue of Arianism, a heretical teaching that denied the divinity of Jesus Christ.

The Council was attended by over 300 bishops, and after much discussion and debate, it produced the Nicene Creed, which affirmed the divinity of Jesus Christ and his equality with God the Father. The Council also established a uniform date for the celebration of Easter, which was to be the first Sunday following the first full moon after the spring equinox.

In addition to these doctrinal and liturgical decisions, the Council also established a number of canons, or rules, governing the organization and operation of the Church. For example, the Council established guidelines for the ordination of bishops, set limits on the jurisdiction of various bishops, and established rules for the resolution of disputes between clergy members.
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