Twelve original studies on Trinitarian theology and its enduring capacity to shape theological discourse, ecclesiology, and society today. The doctrine of the Trinity sits at the heart of Christian identity, shaping how Christians think about faith, worship, and community. The Nicene Creed, recited in churches across the world, invites not only a shared confession but also a deep and ongoing conversation about who God is and how God relates to the world. The Council's articulation of the consubstantiality of the Son with the Father laid the foundation for Trinitarian doctrine and safeguarded the mystery of salvation. It continues to serve as a rich source of interdisciplinary exploration and inspire fresh theological inquiry into the mystery of divine communion, the incarnation of Christ, and the unity and identity of the Church. On the 1700th anniversary of this historic event, the essays in this volume collectively re-examine earlier debates, introduce fresh perspectives, and renew dialogue around doctrines as vital today as in the fourth century. Emphasising the value of constructive engagement between traditions and exploring how Trinitarian theology continues to inform Christian witness in a complex and changing world, this volume offers essential reading for anyone seeking to deepen their understanding of a foundational aspect of Christian faith and history.