What term describes the belief regarding the prisoner's birthplace?

The term "reputed" is the most suitable choice because it refers to the general belief or opinion about someone or something based on reputation or what is generally said. In the context of describing the prisoner's birthplace, "reputed" suggests a widely accepted belief about where the individual originates, aligning with the idea of reputation tied to that place.

The other options suggest different nuances that do not quite fit this context. "Claimed" suggests a more assertive declaration, "reported" implies that something has been formally stated or documented, and "announced" indicates a public declaration or proclamation. However, none of these terms encapsulate the idea of a commonly held belief or opinion as neatly as "reputed."