Final answer:
The Nicene Creed, established at the Council of Nicaea in 325 CE primarily defined the Doctrine of the Trinity, affirming Jesus Christ's divinity and addressing the Arian controversy.
Step-by-step explanation:
The Nicene Creed:
Defined the Doctrine of the Trinity. The Nicene Creed was established during the Council of Nicaea in 325 CE, convened by Emperor Constantine. This ecumenical council addressed the Arian controversy, which questioned the divinity of Jesus Christ. The Creed formulated the crucial concept that Jesus Christ is 'consubstantial' with God the Father, affirming his divine nature and effectively defining the Doctrine of the Trinity.
It set forth the foundational beliefs for mainstream Christianity, solidifying the first official orthodoxy backed by ecclesiastical authority. Although the Nicene Creed addresses the nature of Christ and his relationship to God the Father, it is not directly associated with establishing Papal Authority, outlining the Seven Sacraments, or formulating the concept of Original Sin. These elements were developed or emphasized in different contexts within Christian doctrinal history.