Lungorthin

Lungorthin was one the lords of the fiery demons of dread that were the Balrogs as well as one of the most-trusted captains of Morgoth, commanding his master's hosts and serving him with utter devotion

During the Battle of Unnumbered Tears, Lungorthin led Orc hordes upon the allied Men, Dwarves and Elves as the tide turned in the Foe's favor, cutting a path through the Free Peoples' ranks towards Húrin, whom he captured and dragged in chains before the very feet of Morgoth. When the captive dared speak ill of his master, the Balrog-lord smote him on the mouth.

Appearances

 * The History of Middle-earth series
 * Lays of Beleriand