Final answer:
In the Aeneid, Aeneas speaks to his father, Anchises, in the underworld. Anchises tells Aeneas about the souls of his descendants and explains Stoic cosmology and Orphic concepts.
Step-by-step explanation:
In the Aeneid, the first person Aeneas speaks to in the underworld is his father, Anchises. Anchises tells Aeneas about the souls of his descendants who are destined to ascend to the upper world, as well as providing him with a detailed explanation of Stoic cosmology and anthropology. Anchises also shares insights from Orphic material, such as the idea of the soul being imprisoned in the body.