Final answer:
Laocoon and Turnus almost killed Prince Aeneas, and Tiberinus tried to save him.
Step-by-step explanation:
In Greek mythology, the Trojan priest Laocoon and his sons were almost killed by two sea serpents sent by Athena or Poseidon, as a punishment for Laocoon's warning about the Trojan Horse.
The serpents tortured and killed Laocoon and his sons. However, in the context of the question, it seems to refer to the story of Aeneas, the legendary founder of Rome, in which Aeneas faced several challenges during his journey.
One of the closest instances in which Aeneas' life was threatened was during the final battle between Aeneas and Turnus in Virgil's epic poem, 'The Aeneid.'
Turnus was a rival warrior who nearly killed Aeneas during their combat. However, Aeneas was ultimately saved by the river god Tiberinus, who intervened to protect him.