Yoda

Served the Jedi Order for centuries, taught many younglings
Led the Jedi in many battles during the Clone Wars
Failed to stop Darth Sidious, Jedi Order was destroyed by the Sith
Retreated into exile, lived in isolation on the remote world of Dagobah
Near the end of his life, he was sought out by Luke Skywalker & started training him
Died of old age, became one with the Force