The hero known for his strength in the Trojan War is Achilles, famous for his invulnerability except for his heel. His legendary prowess in battle made him a key figure in Greek mythology, where he is central to Homer's "Iliad." Achilles' story revolves around themes of honor, rage, and the consequences of his choices, ultimately leading to his tragic death. His heel, remaining vulnerable, symbolizes the concept of a tragic flaw, now commonly referred to as an "Achilles' heel."