 Oshichi was born in 1666, the year of the fire horse ("Hinoe Uma"), which recurs every 60 years.Since then, it has been thought inauspicious for a girl to be born in the year of the fire horse – and in Japan, fewer children are born in such years (the most recent being 1966).Three years later, Ihara Saikaku described this case in the book "Kōshoku Gonin Onna" (English translation, "Five Women Who Loved Love").