First, in 1557, Kuroda-jo Castle was attacked by pirates (thought to be in league with Nobunaga ODA) and his elder brother Juro was killed, and in 1559, their lord's residential castle Iwakurajo Castle fell; it is very likely that his father Moritoyo was killed or committed suicide here.
まず弘治_(日本)3年（1557年）に兄十郎が盗賊（織田信長の手勢であるといわれる）に黒田城を襲撃された際に討死、さらに永禄2年（1559年）に主家の居城・岩倉城が落城、この際に父・盛豊が討死ないし自刃した可能性が高い。