There dwelt in Ulster a smith of great renown, a mighty worker in metals, named Cullan. One day Cullan invited King Conor and his nobles to a feast, as was a custom in ancient Ireland where smiths were much esteemed and ranked high in the land.
Setanta was invited but he was playing a game of hurley so he said he would follow them.
After a while setanta came running up to the house. Cullen's dog was let loose and he attacked setanta but setanta killed the dog. After that setanta became the hound of Cullen. He was called Cuchallain - the hound of Cullen.