Allusion in Aeneid

This refers to Paros, an island in the Aegean Sea, famous for the whiteness of its marble.

Rhesus is ally of Troy from Thrace, who is killed by the Greek Diomedes just as he arrived to help the Trojans. A prophecy foretold that if Rhesus's horses ate Trojan grass or drank Trojan water, Troy would not fall. Diomedes and Ulysses made sure that Rhesus's horses didn't have time to eat or drink.

Virgil is referring to the Greek king, Agamemnon, the Trojan king, Priam, and the Greek demigod, Achilles from Homer's Iliad. Although Achilles fought for the Greeks, he and Agamemnon hated each other, and because he fought against Troy, Achilles was also Priam's enemy.

King Priam's oldest son and brother of Paris, Hector is the most powerful Trojan warrior in the Iliad. He fights against and is killed by Achilles.

Juno, queen of the Roman gods, hated the Trojan kingdom in part because of Paris's abduction of Helen of Sparta. Before that, Juno hated Paris for having decided that Aphrodite, rather than Juno, was the most beautiful among the goddesses.