| Definition -
A pronoun that is used to refer to persons.
1. The personal pronoun's form shows if it refers to the speaker, the person being spoken to, or the person being spoken about.
(1) I go to the store. (nominative case)
(2) That's my dog. (possessive case)
Oxford English Dictionary - The term's first citation is from 1668:
"The Personal Pronouns, and any of the rest being us'd Substantively, are capable of Number and Case."
(Wilkins Real Char. 305)