was a son of Tsunehisa

Amago Tsunehisa

was a powerful warlord who gained the hegemony in Chūgoku region, Japan starting as a vassal of the Rokkaku clan. He ruled the domains of Inaba, Hōki, Izumo, Iwami, Oki, Harima, Mimasaka, Bizen, Bitchū, Bingo, and Aki....

.

Kunihisa's faction was named Shingūtō (新宮党) after the town, Shingu where it was based. He had been called "On the military matters, he is like a kami

Kami

is the Japanese word for the spirits, natural forces, or essence in the Shinto faith. Although the word is sometimes translated as "god" or "deity", some Shinto scholars argue that such a translation can cause a misunderstanding of the term...

 and a oni" from his father, Tsunehisa. But he often looked down on those who did not do well on the battlefield and was obnoxious from time to time. In 1554, he was killed by Amago Haruhisa

Amago Haruhisa

was a powerful warlord in Chūgoku region, Japan. He is the second son of Amago Masahisa. Initially named Akihisa , he changed his name to Haruhisa in 1541 after Ashikaga Yoshiharu offered to let him use a kanji from his name....

 supposedly after Mōri Motonari

Mori Motonari

was a prominent daimyō in the west Chūgoku region of Japan during the Sengoku period of the 16th century.-Early years:Mōri Motonari was born under the name Shojumaru in a small domain of Aki province in 1497. He is said to have been born at Suzuo Castle, his mother's homeland...

 tricked Haruhisa into believing that Kunihisa intended to take over Amago clan

Amago clan

The , descended from the Emperor Uda by the Sasaki clan .Sasaki Takahisa in the 14th century, having lost his parents at the age of three years, he was brought up by a nun...

 but one of the reasons may be that Kunihisa had been too arrogant towards young Haruhisa.

The death of Kunihisa and the purge of his faction significantly damaged Amago clan and turned the balance against Mori clan

Mori clan

The Mōri clan was a family of daimyō, descended from Ōe no Hiromoto and established themselves in Aki Province. Their name was derived from a shōen in Mōri, Aikō District, Sagami Province. The generation of Hiromoto began to name themselves Mōri.After the Jōkyū War, Mōri was appointed to the jitō...

 in Mori's favor.

Amago Katsuhisa

Amago Katsuhisa

was a remnant of the Amago clan, a powerful feudal clan in the Chūgoku region, Japan; backed-up by Yamanaka Yukimori, a vassal of the clan.He was born to Amago Masahisa in 1553. In the following year, Katsuhisa's father and grandfather were killed by Amago Haruhisa, leading Katsuhisa to become a...

was his grandson.