Two main foundational myths for Ancient Rome

The first myth is about Aeneas. Aeneas was the son of Venus and Anchises. He was raised nt nymphs, and he was taught by a centaur. When he got older, he fought in trhe Trojan War along with the Dardanians, they were allies of Troy. When the city was sacked and burned by the Greeks, Aeneas and his father fled. He sailed away with a group of Trojan soldiers; he was now searching for a new home. It has been said that the gods told Aenes to build his city at the place where his soldiers ate their plates. Though, after deing taunted by the wing god, his ship ended up landing in Carthage, Africa. While staying there, Aeneas fell in love with a woman named Dido who was the Queen of Carthage. (source 1, source 2)

"Aeneas was born from the union of a mortal, Anchises 1, and a goddess, Aphrodite. Some say that it was Zeus himself who aroused in Aphrodite the desire to be joined with a mortal man, so to prevent her to say mockingly that she had joined all the gods with mortals. Aphrodite came to Anchises 1 in the form of a beautiful maiden, saying she was a mortal woman and the daughter of one Otreus. She explained to the incredulous Anchises 1 that she talked his language because she had been brought up by a Trojan nurse. Anchises 1 was taken by desire, but after they had made love, Aphrodite revealed her true identity and Anchises 1 feared the gods would destroy him for having slept with a goddess. But Aphrodite, who herself grieved for having laid in the bed of a mortal man, assured him that he was dear to the gods and nothing would happen to him, provided he would say their child was the offspring of a nymph, for Aphrodite disposed that the NYMPHS would rear Aeneas and that, as soon as he was a boy, he would be restored to his father."

The other myth is that "Romulus and Remus were twin brothers. Their father was Mars, the God of War, their mother was Rhea Silvia, a vestal virgin and daughter of the King, Numitor. Numitor's brother, Amulius, had taken the throne from him and had forced Rhea Silvia to become a vestal virgin so that she would not have any children who might try to take back the throne.
When the boys were born, Amulius seized them, put them into a basket and threw them into the river Tiber. He hoped that they would drown. However, the boys were rescued by a she-wolf who fed the babies with her own milk and cared for them.
They grew up and were found by the shepherd Faustulus, who took them home and looked after them until they were grown up.
The two young men discovered who they really were and decided to kill Amulius and Put their grandfather back on the throne. After doing this they decided to build a city of their own but could not agree where to build it. Remus favoured the Aventine Hill but Romulus wanted to use the Palatine Hill. They could not reach an agreement and so each began to build his own city enclosed with walls.
One day, Remus visited Romulus and made fun of his wall by jumping over it and saying how easily it could be breached. Romulus was so annoyed that he killed Remus and said the he would kill anyone who mocked his city or tried to break through the walls of Rome.
The legend says that Romulus became the first King of Rome in 753BC and populated his new city with runaway slaves and convicted criminals. He stole women from the Sabine tribe to provide wives for the slaves and criminals and to populate his new city.
The Sabine tribe were not happy about this and declared war on Rome. The war went on for many years but eventually the Sabine tribe and Romulus reached an agreement and the Sabines became a part of Rome under the Kingship of Romulus.
The legend ends by telling how Romulus was carried up to the heavens by his father, Mars, and was worshipped as the God Quirinus." (source)

Book 1