Although many of the Gods came from noble birth, some of the Greek gods seemed to be born from nowhere. Two of the most popular surprise births were the birth of Aphrodite and the birth of the Erinnyes named Alecto, Tisiphone and Megaerax.
There are two versions of the birth of the three Erinnyes. One myth tells that Uranus and Rhea had already parented the Titan and Uranus had cast them down to the underworld. As revenge Mother Earth talked them into revolting against Uranus. The Titan, led by Cronos, surprised him in his sleep. Cronos then grabbed Uranus' genital with his left hand (which has ever since been the hand of ill omen) chopped off his genitals with a flint sickle. Cronos then through the bloody genitals and the sickle in to the sea. While they flew to the ground three drops of blood landed on Mother Earth and she then bore the Three Erinnyes. These three furies were tasked with avenging crimes of parricide and of perjury.
The other version of the myth says that Uranus hated his own offspring and would not allow them to be born. Each time Gaea bore a child Uranus would swallow them whole. One day Gaea decided to plot her revenge. She spoke to her children telling them that it is their father who is imprisoning them and that they should end his reign. None of the children spoke until brave Cronos volunteered. Gaea was overjoyed and they made their plan. Gaea hid Cronos and gave him a sickle. When Uranus came into Gaea's presence Cronos leapt out and castrated his own father. The blood that came from the god's genital leaked on to Gaea and she then bore the Three Erinnyes.
The myth of Aphrodite's birth is directly linked to the birth of the furies, the Three Erinnyes. When the genitals of Uranus and the sickle covered in his blood crashed into the sea the immortal flesh and blood began to swirl and create a foam on the sea. Inside the foam a beautiful goddess formed. After some time Aphrodite rose naked from the foam of the sea standing on a scalloped seashell. She was the most beautiful of all of the gods. So beautiful in fact that the other gods became angry and forced her to marry the least favored of the gods, Hephaestus.