Who was Achilles?

In Tennyson’s famous dramatic monologue “Ulysses”, there is an allusion to Achilles. Achilles’ mother was Thetis, a sea goddess and his father was Peleus, a mortal. Achilles accompanied Ulysses and other Greek heroes to the Trojan War to rescue Helen and restore the prestige of the Greek. He was the greatest hero of the Trojan…