Akechi Mitsuhide
Tadaoki was given the Province of Tango in 1580. Soon after that, he married Hosokawa Gracia, the daughter of Akechi Mitsuhide. In 1582, Akechi Mitsuhide rebelled against Nobunaga and Nobunaga was killed. Akechi turned to Hosokawa Fujitaka and Hosokawa Tadaoki for help. They refused to help him, and Mitsuhide was defeated.