Control Gifu and you control Japan was a common phrase during the Sengoku period (15th to 17th century), since Gifu's central location in Japan made it a desirable location for those trying to unify the country. For over 200 years, the Mino Province (including the present-day city of Gifu) was under control of the Toki clan, a powerful regional clan. However, during the Sengoku period, Saitō Dōsan, a Toki vassal, rebelled against his clan and took control of Mino Province in 1542 and built Inabayama Castle atop Mount Inaba, from which he began his quest to unify Japan.