The Grand Inquisitor is the title given to the leader of the Inquisition, a religious organization that existed around the mid-11th-century GUE, and from 1048 GUE onwards, the leader of Quendor and chairman of FrobozzCo International.
The only known Grand Inquisitor is Mir Yannick, who murdered the previous Grand Inquisitor in 1046 GUE. In 1048 GUE, he murdered Lord Syovar III, the ruler of Quendor, establishing the Inquisition as the new ruling body.
It is the titular character of the game Zork: Grand Inquisitor.