The main source for our knowledge of the Trojan War is Homer’s Iliad (written sometime in the 8th century BCE) where he recounts 53 days during the final year of the ten year conflict. The Greeks imagined the war to have occurred some time in the 13th century BCE. However, the war was also the subject of a long oral tradition prior to Homer’s work, and this, combined with other sources such as the fragmentary Epic Cycle poems, give us a more complete picture of what exactly the Greeks thought of as the Trojan War.
The Trojan War, in Greek tradition, started as a way for Zeus to reduce the ever-increasing population of humanity and, more practically, as an expedition to reclaim Helen, wife of Menelaos, King of Sparta and brother of Agamemnon. Helen was abducted by the Trojan prince Paris (also known as Alexandros) and taken as his prize for choosing Aphrodite as the most beautiful goddess in a competition with Athena and Hera at the wedding of Peleus and Thetis. Menelaos and the Greeks wanted her back and to avenge Trojan impudence.