Which event, convened by Constantine in 325, aimed to settle the nature of Christ's relationship with the Father?

The Council of Nicaea, convened by Emperor Constantine in 325, was significant because it addressed the theological dispute about the nature of Christ's relationship to the Father, specifically the debate over Arianism. This heresy questioned whether Christ was co-eternal and of the same substance as God the Father. The council was the first ecumenical council of the Christian Church, and its resulting Nicene Creed established a unified understanding that affirmed the divinity of Christ, decisively rejecting Arian views. This event not only shaped Christian doctrine but also marked a crucial moment in the history of the Roman Empire's engagement with Christianity.

In contrast, the Edict of Milan, issued in 313, granted religious tolerance to Christianity and ended persecutions, but it did not specifically address Christological debates. The Twelve Tables refers to an ancient Roman code of law, unrelated to theological discussions. The Almagest is an astronomical text by Ptolemy, pertinent to ancient science rather than religious matters. Thus, the Council of Nicaea stands out as the critical event focused on defining the Christian faith regarding the nature of Christ.