Who believed you were born with a blank slate?

In the philosopher john Locke's "An Essay Concerning Human Understanding," he posits that the mind is a tabula rasa, meaning "blank slate" in Latin. As a baby, we are born without preconceived rules or data, and individually begin to form these ourselves through our own sensory experiences. This notion is meant to imply that Locke believed humans had the capacity to independently define the values of their own character. The only thing he believed we were born with is a basic identity as members of the human species. Coupled together, this led to the Locklean doctrine of "natural" rights.