¶1] Oin Aub, whence the name? Not hard to say. There was a famous warrior reigning over the Gaedil. He reared two horses with the fairy folk of Sid Ercmon, among the droves of Aba Cenindain. The king's name was Nemed mac Nama. The two horses were loosed for him from the Sid. A stream broke forth after them out of the Sid, and there was much foam on that stream, following them, and the foam spread over the land exceedingly, and so it remained a year's length. Therefore that water was called Uanob (Foam-river): and of it Cuchulainn said, Over the foam of the two horses of Emain am I come (that is, when he came to woo Emer). Hence men say Oinub.