Kokuou

Kokuou, more commonly known as the Five-Tails or Gobi, is a tailed beast sealed within Han from Iwagakure.


It was captured, extracted, and sealed by the Akatsuki. In the anime, Kokuou is indicated to have been one of the two tailed beasts that Akatsuki captured before the start of Shippuden.
(Source: Narutopedia)