Lured by promised by Oda Nobunaga, Shibata Shigeie (1547-1587) revolted against Kagekatsu, but was defeated after a fierce seven year war, and the clan was destroyed. The Shibata were instrumental in Kagekatsu's victory but were highly incensed when Kagekatsu failed to follow through on his promises to increase their territory. After Kenshin's death, his two adopted sons Uesugi Kagekatsu and Uesugi Kagetora fought a war over the succession. However, by the Sengoku period, the Shibata became retainers of Uesugi Kenshin, and Shibata Nagatsu (1538-1580) was ranked among Kenshin's top seven generals. By the middle of Muromachi period, the Shibata were the most powerful of the "Agekitashu", a group of local petty lords who were mostly independent due to their distance from the provincial capital at Jōetsu.
The Shibata were a cadet branch of the Sasaki clan, from Sasaki Moritsuna, a retainer of Minamoto no Yoritomo who had been awarded estates in this area for his role in suppressing a local rebellion. The construction date of the original Shibata Castle is unknown however, the surrounding area was under control of the Shibata clan since the Kamakura period. Historically, the area was a vast marsh made by Shinano River and the Agano River, which were both important trade routes for Echigo Province. Shibata Castle is located at the center of the modern city of Shibata, approximately 20 kilometers east of the city of Niigata. The castle was also known as "Ayame-jō" ( 菖蒲城, "Iris Castle" ). Throughout the Edo period, Shibata Castle was home to the Mizoguchi clan, daimyō of Shibata Domain. Shibata Castle ( 新発田城, Shibata-jō) is a flatland-style Japanese castle located in the city of Shibata, Niigata Prefecture, Japan. Dark Blue: preserved moat T = Omote-mon Red = Tatsumi Yagura Green = Secondary Enclosure
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