I want to test the ability of students to read a passage and answer questions about it. Could you please come up with a good question for the passage "In the 18th century, the Moroccan Sultan Moulay Ismail "the Bloodthirsty" (1672–1727) raised a corps of 150,000 black slaves, called his Black Guard, who coerced the country into submission."? 

What was the name of the territory where the Bloodthirsty had power?