Nobunaga Oda is called "Right House". What official position does this refer to?

Right Prime Minister (Taishou ぅだぃじん): No.2, with the same power as left Prime Minister. When Minister Zuo is unable to leave the DPRK or concurrently hold the post for some reason, he will act as the chief executive for government affairs and ceremonies. According to the word "Prime Minister's House" in the Qin Dynasty (China), the left and right ministers are also called Jacky House and Right Prime Minister's House, or Zuo Fu House for short.

Nonomura, Oda Shigeru, Tokugawa Ieyasu and Toyotomi Hideyori have all held this post.