Durin the Deathless was the first ever Dwarf in Middle-earth, the world of The Lord of the Rings. Unlike the Elves and Men, created by the god of J. R. R. Tolkien's universe, Eru Ilúvatar, the Dwarves were created by Aulë, the Vala of crafting and forging. The Elves and Men had not yet awoken in Middle-earth, and Aulë was impatient to pass his knowledge on to others, so he created seven Dwarves without Ilúvatar's permission, the first being Durin. When Ilúvatar learned of the Dwarves, he allowed them to exist, but he ordered that they must sleep until after the Elves and Men inhabited Middle-earth.
Source：https://www.cbr.com/lord-of-the-rings-durin-the-deathless-explained/
