was a remnant of the Amago clan, a powerful feudal clan in the Chūgoku region of Japan, backed up by Yamanaka Yukimori, a vassal of the clan.
He was born to Amago Masahisa in 1553. In the following year, Katsuhisa's father and grandfather were killed by Amago Haruhisa, leading Katsuhisa to become a Buddhist monk.
In 1578, Katsuhisa defending Kozuki Castle for Oda clan under Toyotomi Hideyoshi against the Mōri clan, but was attacked by Kobayakawa Takakage and Kikkawa Motoharu in Siege of Kōzuki Castle, he was defeated, and committed suicide.