Who is Dido? What happens between Aeneas and Dido? passage below ^

In the forests of Mount Ida he built ships enough to set forth with all his followers in
quest of the new home, which his mother, the goddess Venus, gave him hopes of.
He had adventures rather like those of [Odysseus] as he sailed about the
Mediterranean. Once in the Strop hades, some clusters belonging to the Ionian
Islands, when he and his troops had landed to get food . . . [they encountered]
harpies, horrible birds with women’s faces and hooked hands, with which they
snatched away the food and spoiled what they could not eat. The Trojans shot at
them, but the arrows glanced off their feathers and did not hurt them. However,
they all flew off except one, who sat on a high rock, and croaked out that the
Trojans would be punished for thus [attacking] the harpies by being tossed about
till they should reach Italy, but there they should not build their city till they should
have been so hungry as to eat their very trenchers [plates].
[The Trojans] sailed away from this dismal prophetess and touched on the coast of
Epirus, where Aeneas found his cousin Helenus. . . . Helenus was a prophet, and he
gave Aeneas much advice. In especial he said that, when the Trojans should come
to Italy, they would find, under the holly trees by the riverside, a large, white, old
sow lying on the ground with a litter of thirty little pigs round her, and this should
be a sign to them where they were to build their city