The doctrine of the Trinity stands out as more than a single doctrine within Christian theology. It has as its characteristic feature that it takes up all of this material together, against the horizon of the eternal being of God in se, systematically posing the question of how salvation history is to be correlated with the divine being in itself. The task of the doctrine of the Trinity is to describe the connection between God and the economy of salvation. More concretely, the doctrine of the Trinity asks about how the threefold act of God in history corresponds to the triune being of God in eternity. This article discusses the place and field of trinitarianism; recentring trinitarianism on the economy of salvation; the economic–immanent axis; and real presences.