Abstract
Locke’s concepts of person and self as they first appeared in the 1694 essay were not original to him but had already appeared in the Trinitarian controversy in England in the early 1690s. In particular, William Sherlock, who in 1690 argued that the Trinity might be understood as composed of three distinct self-conscious minds or persons in one God, previously used not only concepts but also phrases that Locke used in his definition of person. Both Sherlock and Locke defined person as a unity of mind or self that, in Sherlock’s terms, extends as far as consciousness reaches