The psychological need for history is to perhaps to confirm our existence through perpetuation of myth, national identity and diversity in various mediums. How this has changed over time can be traced to the historian's aims, purposes and constructed by their specific methodology. Through events, ''facts'' are constructed which accrue to what Marwick states as ''the body of knowledge'' we call history, ok and here you can include the historians such as Jenkins, in comparison with say Herodotus and write what their purpose was in their context. I.e. was it to entertain, or was it more of a popularising mission to bring awareness to that area of debate.
Sorry I'm rambling =P
So in layman's terms: mention why that historian wrote that particular interpretation, their purpose and how that relates to the needs of their context.