 Brower and Rea argue that their theory stands a better chance of being orthodox than its competitors, and point out that a part of their motivation is that leading medieval trinitarians such as Augustine, Anselm, and Aquinas say things which seem to require a concept of numerical sameness without identity. (See Marenbon 2007, Brower 2005, and the supplementary document on the history of Trinity theories, sections  3.3.2,  on Augustine, and  4.1,  on Thomas Aquinas.)