Game of Thrones: Everything You Should Know About Valyrian Steel Weapons and Who Owns Them

Longclaw originally belonged to House Mormont but is gifted to Jon Snow by Lord Commander Jeor Mormont during his early days at the Night's Watch. He gives Jon the weapon as a reward for saving him from a wight beyond the Wall and later replaces the bear on the sword's pommel with a direwolf (the sigil of House Stark).