He saved his people.
Not many people can say that, but High General Turalyon can. On the slopes of Blackrock Mountain, when the greatest warrior the humans of the world of Azeroth had ever produced went down to dusty death, one man turned shattering defeat into hallowed victory. That man was Turalyon, paladin of the Order of the Silver Hand, strategist of the combined forces of the Alliance of Lordaeron during the Second War. It was Turalyon's hand that raised Lothar's broken sword in outrage over orcish perfidy. It was Turalyon's voice that roused the fury of the Alliance at the sight of the dead hero. And it was Turalyon's will that broke the orcs once and for all, that drove Doomhammer to his knees in defeat.
Turalyon beat the Horde at Blackrock Mountain. Turalyon led the Alliance to the very site of the Dark Portal, where Khadgar destroyed its physical form. And beyond that, it was Turalyon who led the Alliance Expedition beyond that same portal, to face the shaman Ner'zhul and his twisted ambitions. Turalyon's forces managed to seal the Dark Portal and prevent Ner'zhul's destruction of Draenor from affecting Azeroth, and in so doing, possibly saved the world entire.
Since then, no word has of his ultimate fate reached those he led, saved and left behind. It is indisputable that this paladin is one of the greatest heroes of his people, possibly even the greatest paladin who has ever lived. (With all due respect to Uther, Turalyon's record is unambiguous in its greatness.) Yet Turalyon never felt himself to be great. Struggling with doubt every day of his life, convinced the death of Lothar was his fault, he endured and pressed on, steadfast unto the edge of death and perhaps even past it.