Oda, Azai, and the Toyotomi Legacy — bloodlines, shattered oaths, and the path to Osaka's end
In 1564 Oda Nobunaga bound his sister Oichi in marriage to Azai Nagamasa, turning a rivalry into an alliance that opened the road to Kyoto. Six years later Nagamasa broke that oath to honour an older loyalty — the Asakura clan — and the betrayal nearly destroyed Nobunaga. The war that followed at Anegawa and Odani erased the Azai house, but the bloodline survived in Chacha, who as Yodo-dono carried the feud into Osaka Castle itself.
In 1564 Oda Nobunaga sealed an alliance with Azai Nagamasa by offering his younger sister Oichi in marriage. The pact shielded Nobunaga's northern flank and opened a secure corridor through Ōmi, allowing him to march on Kyoto and install Ashikaga Yoshiaki as shogun in 1568.
In 1570 Nobunaga invaded Echizen to crush the Asakura clan. Nagamasa faced an impossible choice between his modern blood alliance with Nobunaga and his hereditary feudal loyalty to the Asakura. He chose the Asakura, attacking Nobunaga from behind and nearly annihilating the Oda army.
Enraged by the betrayal, Nobunaga combined forces with his ally Tokugawa Ieyasu. At the Anegawa River in 1570 the Oda–Tokugawa coalition routed the Azai–Asakura army, shattering their field supremacy and forcing the Azai to retreat to their mountain fortress at Odani.
In 1573 Nobunaga brought his full wrath upon Odani Castle. Realising the end had come, Azai Nagamasa committed ritual suicide, extinguishing the sovereign Azai line. His wife Oichi and their daughters were safely extracted — and daughter Chacha would later rule from Osaka Castle as Yodo-dono.
Explore the stone walls, hidden moats, and battleground sites with a resident historian who lives beside Osaka Castle. Small groups. English. Max 6 guests.
Book Warrior Monks, a Peasant, and a ShogunThe Azai bloodline didn't end at Odani — it walked straight into the heart of Osaka Castle through Yodo-dono, carrying with it the same oaths, betrayals, and blood debts that destroyed her father. What began as a marriage pact in 1564 didn't finish until the keep itself burned in 1615.
If you'd like to walk the ground where that inheritance finally played out, Warrior Monks, a Peasant, and a Shogun follows that story across the very site where it unfolded.
The Oda–Azai war was the hinge that swung the Sengoku era — and the ground it was fought over leads straight into Osaka Castle’s own history, and into the decade-long siege of the Ishiyama Hongan-ji that followed.
Walk with a historian who lives beside it. Small groups. Osaka Castle every day • English • Max 6 guests
Book Warrior Monks, a Peasant, and a Shogun Call / Text Edward WhatsApp EdwardEdward Iftody — Osaka Castle’s Resident Historian