Greyhawk
Temple of Maglubiyet in Highport
Maglubiyet, the head of the goblin and hobgoblin pantheon, requires sacrifices every new moon of creatures with souls, and the priests of this temple (both goblin and hobgoblin) are happy to oblige with fresh slaves. The high priest is a hobgoblin shaman named Jukko, the spiritual leader of the goblins and hobgoblins of the city (while most pay homage to the Earth Dragon, they retain loyalty to their racial patron).
Sean K. Reynolds and Chris Pramas. Greyhawk Adventures, Slavers, 2000