Eitri

Eitri is the King of the Dwarves, an ancient race of skilled forgers and blacksmiths who hail from the realm of Nidavellir.

Biography
Eitri and his people are close allies of the Asgardians, even creating the mighty weapon Mjølnir after being asked by Odin to forge it.

When the Bifrost Bridge was destroyed, the Rock Trolls, having coveted the Dwarven Forges for many millenia, attacked Nidavellir, knowing that Asgard could not come to defend King Eitri and his people. Using the power of the Tesseract, Heimdall was able to rebuild the bridge and aid Nidavellir; the Rock Trolls were defeated by Thor and the Asgardian army.