Son Gokuu "Yonbi, Four-Tails, King of the Sage Monkeys"
About
Son Gokuu, more commonly known as the Four-Tails or Yonbi, is a tailed beast sealed within Roushi of Iwagakure.
It was captured by Kisame Hoshigaki then extracted and sealed by the Akatsuki.
(Source: Narutopedia)
