Passage Summary: A historian suggests that instead of struggling with a complex definition of 'medieval epistemology,' we should just define it as 'whatever medieval epistemologists believed.'

Conclusion: The best way to define medieval epistemology is to simply include whatever beliefs medieval epistemologists held.

Reasoning: Defining the field based on the actual beliefs of its practitioners provides a clear rule for what should be included or excluded from historical study.

Analysis: The historian's argument is trapped in a circular loop. To know what 'medieval epistemology' is, you have to look at 'medieval epistemologists.' But how do you identify who the 'medieval epistemologists' are without first knowing what 'medieval epistemology' is? It's like trying to define a 'glip-glop' as 'anything a glip-glop maker makes'—you're still stuck not knowing what a glip-glop is. Look for an answer that highlights this circularity or the impossibility of identifying the people before the field is defined.