Battle of Sekigahara
Before the Battle of Sekigahara, the central Mino Province was ruled by Oda Hidenobu, Oda Nobunaga's grandson, from his base at Gifu Castle. However, as Hidenobu sided with Ishida Mitsunari at the Battle of Sekigahara, his territory was confiscated by Tokugawa Ieyasu. In 1601, Ieyasu granted the area to his son-in-law Okudaira Nobumasa. Okudaira Nobumasa was allowed to build Kanō Castle with materials from the dismantled Gifu Castle. This was the birth of the Kanō Domain.