Final answer:
The frame narrative for Catullus' epyllion (#64) is the foundation myth of Rome, which includes stories of Romulus Remus and Aeneas.
Step-by-step explanation:
The frame narrative for Catullus' epyllion (#64) is the foundation myth of Rome. The epyllion tells the story of the wedding of Peleus and Thetis, and within this story, Catullus includes a digression about the founding of Rome and the origins of its people. The foundation myths of Rome, such as the stories of Romulus and Remus and Aeneas, are a common vehicle for explaining the origins of Rome and its people.