Amago clan
In 1554, Motonari's intrigues led to the death of Amago Kunihisa in battle with Amago Haruhisa. Kunihisa, the son of Amago Tsunehisa, led a faction named the Shingūtō (新宮党) after the town, Shingu, where it was based. He had been trusted with military matters by his father Tsunehisa but he often looked down upon those who did not do well on the battlefield and was obnoxious from time to time. Supposedly, Motonari tricked Haruhisa into believing that Kunihisa and Era Fusahide (江良房栄) intended to take over the Amago clan. The circumstances may have been aggravated by Kunihisa's arrogance towards young Haruhisa. The death of Kunihisa and the purge of the Shingūtō weakened the Amago clan considerably.