Which Jedi Master is famous for training Luke on a swamp planet?

On the swamp world of Dagobah, Luke receives intensive instruction from the small, ancient Grand Master famed for cryptic wisdom and rigorous tests—lifting the X-wing, confronting the cave vision, and the mantra “Do or do not. There is no try.” Distinguish the distractors this way: Obi-Wan begins Luke’s training and directs him to Dagobah but doesn’t train him there; Qui-Gon belongs to the prequel era and dies on Naboo; Mace Windu, a Council leader, never meets Luke. After Order 66, the master chose Dagobah’s murky isolation—its strong Force presence helped conceal him from the Empire. Having trained generations of Jedi, he became Luke’s crucial mentor, shaping the path that would redeem Anakin and bring balance back to the Force.