In 1584, Moritaka was assassinated by his attendant Sanzaemon OBA, and in 1586, Kamewakamaru (Kameomaru ASHINA), Moritaka's orphaned son who succeeded Moritaka, died at the young age of three.
1584年に近従の大庭三左衛門に暗殺され、その後を継いだ盛隆の遺児亀若丸（蘆名亀王丸）も1586年に3歳で夭逝。