According to Aristotle, who defined the classic Greek literary tragic hero, they should be virtuous, capable and powerful (i.e. "heroic"), and also feel responsible to the rules of honor and morality (that guided Greek culture). These traits make the hero attractive and compelling, and gain the audience's sympathy. While being heroic, the character must also have a tragic flaw (also called hamartia) or more generally be subject to human error, and the flaw must lead to the character's downfall. On the one hand, these flaws make the character "relatable," someone with whom the audience can identify.