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 "Several families of Byzantine Greece were of Norman mercenary origin during the period of the Comnenian Restoration, when Byzantine emperors were seeking out western European warriors. The Raoulii were descended from an Italo-Norman named Raoul, the Petraliphae were descended from a Pierre d'Aulps, and that group of Albanian clans known as the Maniakates were descended from Normans who served under George Maniaces in the Sicilian expedition of 1038."? 

What are Raoul,  Pierre d'Aulps and  George Maniaces?