This report provides an in-depth analysis of the doctrine of the Trinity within Christian theology. It begins by defining the concept and its central role in Christianity. The report then explores the historical development of the Trinity, tracing its evolution through the ideas of Justin Martyr, the Ecumenical Councils of Nicea and Constantinople, and the writings of St. Augustine. The document highlights the changes and modifications in the understanding of the Trinity over time. Furthermore, the report examines the contemporary relevance of the Trinity for ministry, emphasizing its importance in connecting various Christian denominations, its presence in scripture, and its role in salvation. It concludes by reiterating the Trinity's significance as a fundamental theological principle and a unifying force within Christianity.