Ajax, who had been dead for 50 years by the time of the war.
Homer's Iliad and Odyssey.
Nestor, king of Pylos.
because he was sexy
about 800 bc
It's one of the oldest surviving records of a historical event; and one of the oldest writings in the world.
Menelaus and his brother Agamemnon. Some stories also say it was Achilles, but Menelaus and Agamemnon were in charge of everything.
Poseidon helped the Greeks win the Trojan War
By mouth, from father to son.
He appears to be in many stories such as the Trojan War, when Apollo tricked Artemis into killing her spouse Orion, and many more.
Perseus did not participate in the Trojan War, as he is a mythological hero from an earlier era in Greek mythology, well before the war took place. He is best known for his adventures, including slaying Medusa and rescuing Andromeda. The Trojan War primarily involved heroes like Achilles, Hector, and Odysseus, who were from a later generation of Greek mythology. Perseus's stories are separate from the events of the Trojan War.
The date when the Greeks used the Trojan horse to enter inside the Trojan walls had been calculated for the first time using an eclipse mentioned in the stories of Homer. The date was 1188 B.C.
There is archeological evidence to support a historic "Trojan War" though if the events were linked to the stories, no one can say for sure yet. Records would have to be found on-site to link such into "reality".