Kuninobu TAKEDA, a vassal of Nobumichi YAMANA, renovated Kyushozan-jo Castle (Tottori-jo Castle) in 1545, but he incurred his master's suspicion of rebellion because of the fortified castle and was assassinated.
1545年、山名誠通の家臣武田国信が久松山城（後の鳥取城）を改築した。