Koto-in Temple was founded in 1602 by Tadaoki HOSOKAWA, a resourceful general who made his name during the Sengoku Period (Period of Warring States) (Japan) and one of the seven disciples of tea ceremony master Rikyu, and he named his uncle Gyokuho Joso as kaisan (founding priest).
戦国時代(日本)に智将として名を馳せ、茶人としては利休七哲の1人として知られる細川忠興（三斎）が叔父の玉甫紹琮（ぎょくほじょうそう）を開山として慶長7年（1602年）創建する。