In the Iliad, she is described as the loveliest of the daughters of Priam (King of Troy), and gifted with prophecy. The god Apollo loved her, but she spurned him. As a punishment, he decreed that no one would ever believe her. So when she told her fellow Trojans that the Greeks were hiding inside the wooden horse...well, you know what happened.
Well worth your time: this essay on Obama as reader and militarist, by Teju Cole, published today at the New Yorker Online. (It's currently #2 in poplarity on the entire New Yorker site, behind the article about the pope, and #3 in "most e-mailed.")