If you want to understand the western arts or literatures smore in depth, Greek mythology is one of important knowledge that can not be missed (I think another is the Holly Bible). Torjan war is one famous example. Even in the security issue of Internet, Trojan house is denoted as some bad-intention programs that damage your computer system from inner. Besides, we will describe a very beautiful girl with "Helen" who is the most beautiful girl in the mythology.
The movie is just adapted from this famous event in the age of ancient greece.