Terrance, from Ultima V: Lazarus
At first Terrance only spoke about his apple trees and how the Shadowlords caused them to whither with their mere presence. However, after some talking, Terrance accidently revealed that he was a member of the Resistance. After the Avatar promised to stay silent about it, Terrence directed the hero to Yew, to speak with Chamfort about joining the Resistance.
Telling Terrance's name to Chamfort was the key to enter the Resistance.