The first Ikkan HIKI was from present-day Hangzhou City, Zhejiang Province, but Ching's invasion extended to the southern China, so he worried about his safety and exiled himself to Japan depending on Seigan Soi Osho (priest Seigan) of Daitoku-ji Temple around the Kanei era.
初代一閑は現在の浙江省杭州市の出身であったが、清の侵攻が中国南部まで及び、身の危険を感じて大徳寺の清巌宗渭和尚を頼り、寛永頃に日本へ亡命した。