 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.During Dōsan's reign, his daughter Nōhime married Oda Nobunaga, the heir of the fast rising clan in the neighboring Owari Province, with the hopes of an alliance of the two families' would present a powerful front against their competitors.However, it would be Nobunaga that eventually absorbed Dōsan's Saitō clan in the mid-sixteenth century, as Dōsan had done to his retainer.