In J. R. R. Tolkien's fictional universe of Middle-earth, Mm was the last of the Petty-dwarves.

Mm lived with his two sons at Amon Rdh in middle Beleriand, where he kept a secret treasury. During Trin's time with the Outlaws, Mm and sons were seen as they snuck past the outlaws carrying heavy sacks. Mm was captured, and arrows were shot at his sons Ibun and Khm.

In exhange for his life, Mm was forced to lead the outlaws to his secret halls in Amon Rdh. There, it turned out Khm had been killed by an arrow, and Trin repenting offered his service to Mm. For this reason Mm tolerated the outlaws, and eventually even took a liking to Trin.

When Beleg Cthalion arrived at Amon Rdh, Mm was angry: he hated Elves, especially the Sindar. Nevertheless he had to tolerate the Elf in his halls. After Amon Rdh was betrayed to Morgoth, Mm somehow escaped, but it seems Ibn was killed by Orcs. Eventually Mm made his way to Nargothrond after Trin had killed Glaurung, and he took the treasure for his own.

Hrin Thallion, who had seen all that had happened to Trin with Morgoth's eyes, came across Mm in Nargothrond, and killed him, deeming him partially responsible for Trin's fate. With his dying words Mm cursed the treasure. Hrin's band brought the treasure of Nargothrond to Doriath, where eventually the gold was a reason for the Sack of Doriath and the death of Thingol.

Other versions of the legendarium

Note that in the published The Silmarillion Mm hardly appears. His rle is much expanded in the Narn i Chn Hrin as published in the Unfinished Tales, and in the Wanderings of Hrin.

In earlier versions of the Silmarillion as detailed in The History of Middle-earth series, Mm was a much more evil character, who actively betrayed Trin. But as Dwarves gradually changed in Tolkien's writings from evil Orc-like beings to the Dwarves they later became, Mm's character was changed, and in the final texts he is no longer a true villain, but almost a tragic character in his own right.

Dwarves of Middle-earth

Azaghl | Balin | Bifur | Bofur | Bombur | Borin | Din I | Din II Ironfoot | Ds | Dori | Durin(s) | Dwalin | Fli | Fli | Frerin | Frr | Frr | Fundin | Gamil Zirak | Gimli | Glin | Grin | Grr | Ibn | Khm | Kli | Lni | Mm | Nin I | Nin II | Nin son of Grr | Nli | Nr | Narvi | Nori | in | Ori | Telchar | Thorin I | Thorin II Oakenshield | Thorin III | Thrin I | Thrin II | Thrr

Kingdoms of the Dwarves
Belegost | Iron Hills | Khazad-dm | Lonely Mountain | Nogrod

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