The correct answer is Telling a story within a story.
The majority of mediaeval authors tended to utilise a story within a story to build their narratives. This literary device's roots can be found in a similar tactic known as a "frame story," which uses a supplemental story to aid the narrator in telling the primary story.
The narrative of mediaeval authors was organised as a story inside a story that typically took the form of biographies of saints and was framed by a moralising and illustrative goal. As a result of these aims, they were created in monasteries, with many of them being written in Latin.
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