It might be this ([Yato-no-kami][1] on Wikipedia):

> The Yato-no-kami (夜刀の神?, "gods of the night-sword") are snake deities in Japanese folklore appearing in the Hitachi No Kuni Fudoki. They lived in Namegata county, in fields near the government office. They were rumored to bring familial extermination on anyone who saw them. Eventually, they were killed by a man clearing the fields, enshrined, and banished to the mountains.

The fact that Yato doesn't have any shrine and in the article above it says that Yato-no-kami is enshrined. And on the past of Yato in Noragami he is a God that kills people and killed a regalia, in the article above it says that the Yato-no-Kami exterminate people. Also the Yato-no-kami are also known as the gods of the night sword and the last regalia that Yato handled in Noragami is Yuki which is a sword. And in the article it says that Yato-no-Kami is a snake deity, if you look closely at Yato's eyes it looks like a snake's eyes because his pupils are thin that is the same with the snakes.


  [1]: http://en.wikipedia.org/wiki/Yato-no-kami