One could infer that Ivanhoe takes place in the Middle Ages (500-1500 A.D) because the passage portrays a monarch, or a king ruling over a division of social classes (like nobles and knights. Historically this is called Feudalism). Happy to help!
Hebelieves that before jumping to the conclusion that certain video games increase violent behavior in young people, it is necessary to study the effects for a longer period of time.