Nagamasa Azai

Nagamasa Azai was a daimyo of the Azai clan, and ally of the Asakura and the Oda, through marriage to Nobunaga Oda's sister, Oichi. When Nobunaga started a war with the Asakura, Nagamasa decided to side with them, and launched a surprise attack on the Oda, although he was later defeated. Before his death, he sent Oichi back to Nobunaga.