The main base of the Amago clan was in Sanin (mountain provinces behind the Sanyo or Inland Sea provinces), and because the power relations of the clan contained a superficial hierarchical one between the lord and vassals and also probably Tsunehisa had some problems himself, many local lords of Izumo Province ended up in staging a rebellion against the clan.
実際の尼子氏の基盤は山陰が主であり、勢力図も形式的な主従関係が含まれたものであり、更には経久自身にも問題があったのか多くの出雲国人の造反を招いている。