In 1769, the English bishop and theologian Edmund Law published a Defence of Mr. Locke's Opinion concerning Personal Identity. In this work, Law attempted to ‘explain and vindicate Mr. Locke's hypothesis’ (301) by offering a new account of Lockean persons. Law's account centers around three key claims. First, persons are modes — very roughly, properties — rather than substances. Second, the relevant properties are those that make moral evaluation appropriate, thus taking seriously Locke's insistence that ‘person’ is a forensic term. And third, the fact that persons are modes is what makes a demonstrative science of morality possible.
I am not convinced that Law's interpretation actually vindicates Locke, though it does make his theory come out rather better than is typically imagined. I am, however, convinced that Law's interpretation provides the best available account of Lockean persons.