After Oda Nobunaga defeated Imagawa Yoshimoto at the Battle of Okehazama in 1560, securing his eastern borders, he turned his attention to the conquest of Mino Province to the north. He built a castle on Mount Komaki in 1563 as his base of operations due to its proximity to the middle and eastern areas of Mino. Nobunaga succeeded in securing Mino by 1567 and transferred his seat to Inabayama Castle (the future Gifu Castle) in 1567 and then turned his attention to the conquest of the Kansai region to the west, abandoning Komakiyama Castle.