Eventually, they mounted a victorious final attack at the Siege of Inabayama Castle. After taking possession of the castle, Nobunaga changed the name of both Inabayama Castle and the surrounding town to Gifu. Nobunaga derived the term "Gifu" from the legendary Mount Qi (岐山 "Qi" in Standard Chinese) in China, on which the Zhou dynasty is fabled to have started. Nobunaga revealed his ambition to conquer the whole of Japan, and also started using a new personal seal that read Tenka Fubu (天下布武), which means "All the world by force of arms" or "Rule the Empire by Force". Remains of Nobunaga's residence in Gifu can be found today in Gifu Park.