Background
He killed his uncle Kimotsuki Kaneshu to become the head of the clan after his father, Kaneoki, died.
肝付 兼続
He killed his uncle Kimotsuki Kaneshu to become the head of the clan after his father, Kaneoki, died.
Kanetsugu was a skilled and smart leader but his domain happened to be next to that of the most powerful clan in Kyūshū, Shimazu clan and Kimotsuki family would be crushed by them. On the other hand, he moved to unify Ōsumi Province and captured Takaoka Castle in 1538 to capture the majority of the province. In 1561, the relationship between his clan and Shimazu collapsed and Kanetsugu allied with Itō clan of Hyūga Province to counter Shimazu.
In the same year, he repelled invading Shimazu troops with much success and killed the younger brother of Takahisa, Shimazu Tadamasa.
In 1562, Kanetsugu and his troops captured Shibushi district to hold the largest domain. In 1566, Shimazu clan massed its army and invaded again capturing Kōyama Castle as well as most of Kimotsuki"s domains.
The desperate Kanetsugu committed suicide near Shibushi area where he had a small castle to which he had retired.