A Force-sensitive Human male journeyed alongside a youthful Yoda long ago, specifically centuries prior to the Battle of Yavin, culminating in their ship's wreckage on an unknown swamp world.
The Hysalrian Jedi Master, known as N'Kata Del Gormo, discovered their presence and began to teach them about the Force. Yoda underwent complete training and ultimately achieved the rank of Jedi Knight.