Modern theology claimed that it ignited a renaissance in trinitarian theology. Really, it has been a renaissance in social trinitarianism. Classical commitments like divine simplicity have been jettisoned, the three persons have been redefined as three centers of consciousness and will, and modern agendas in politics, gender, and ecclesiology determine the terms of the discussion. Contemporary trinitarian theology has followed the spirit of this trajectory, rejecting doctrines like eternal generation which were once a hallmark of Nicene orthodoxy and reintroducing subordinationism into the Trinity. Motivated by the longstanding need to retrieve the classical doctrine of the Trinity, theologian Matthew Barrett brings together Protestant, Roman Catholic, and Eastern Orthodox scholars to intervene in the conversation. With over forty contributions, this ecumenical volume resurrects the enduring legacy of Nicene orthodoxy, providing a theological introduction that listens with humility to the Great Tradition. The distinct yet united voices of On Classical Trinitarianism summon the next generation to move past modern revisionism for the sake of renewing classical trinitarian theology today. Together, they demonstrate that Nicene orthodoxy can endure in the modern world and unite the church catholic.