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Throughout the centuries, the Dwarves believed Durin’s spirit was immortal, with a cycle of rebirth occurring every time a new ruler bore his name. Notably, Tolkien acknowledged this cyclical nature, writing about how five different monarchs throughout history bore the name Durin, each regarded as a reincarnation of the first.
Tolkien elaborated upon these themes later in his career, refining and expanding his lore. For instance, the character of Durin VI, known as Durin the Last, emerged in later writings, signifying Renaissance efforts to reclaim Khazad-dûm after the fall of Sauron and the triumph of the Free Peoples at the end of the War of the Ring.