 In the 3rd century there were also Trinitarian theologies expressed in writings against Monarchianism, Sabellianism and Modalism.Tertullian's treatise against a Patripassian heretic named Praxeas, who claimed that the Father had suffered with the Son on the cross, is arguably the oldest extant treatise with a detailed explicit Trinitarian theology.In his "Against Praxeas" Tertullian wrote