From the Underdark (Forgotten Realms 3rd edition D&D) sourcebook:
Minotaur (listed as a potential character race in an Underdark themed campaign)
"With the exception of the vast region known as the Labyrinth, minotaurs control few realms of their own in the Underdark. Most are found elsewhere, often serving as marauders, mercenaries, and slaves in the great drow and duergar cities. Minotaurs tend to be cruel, dimwitted, and violent, but they are loyal to their comrades and fearless in battle. A minotaur adventurer can travel freely through the domains of most Underdark races, selling his sword to the highest bidder. Minotaurs who turn to good often strive to break the power of slaveholding races and fight furiously for the emancipation of captives."
