The story of Aries:

The origin of Aries stems from the tale of the Golden Ram. In a plot to trap the centaur Ixion, Hera created a woman looking nearly identical to herself out of a cloud and named her Nephele. She then forced King Athamus to marry this woman. This relationship didn't work out at all as Athamus became bored with Nephele fairly quickly and left her.Then poisoned by Hera, he attempted to sacrifice their son. Heracles sent a Golden Ram to save him and sacrificed it to Zeus and in turn Zeus placed the mighty ram among the stars for his heroic deed.