The Patriarch

The Patriarch was a virtual representation of one of Ratonhnhaké:ton's genetic memories, relived by Desmond Miles in 2012 through the Animus.

Description
Connor was told of a male deer impervious to firearms.

Dialogue
Connor found unique deer tracks and used Eagle Vision to spot the deer.
 * Hunter: Another hunter came through a few days ago telling a story I've heard before - fifteen point buck that's impervious to musket shot. They hit him every time but every time the big fella just gets right back up. I reckon a blade to his throat would do the job but he's hard to get close to.

Outcome
After killing and skinning the male deer, Connor earned a Memento in his bedroom at the Davenport Homestead.

Reference

 * Assassin's Creed III