Date Shigenari

Date Shigenari (1568-1646) was a cousin of Date Masamune and the chief of the "Date Four Heavenly Kings," a fierce general who supported Masamune's domination of Oshu. He was a rare figure among Sengoku warriors, combining ferocity so great he was called "the demon of military exploits" with the intellectual aspect of authoring the "Shigenari-ki" chronicle.

Shigenari's father was Date Saneyori, a prominent member of the Date clan, and he showed a strong character from childhood. Standing at the forefront of Masamune's Oshu unification campaigns, he accumulated many military achievements in battles against the Hatakeyama, Soma, and Ashina clans. At the Battle of Suriagehara in 1589, he contributed to the decisive victory over Ashina Yoshihiro, sealing the Date clan's domination of Oshu.

However, Shigenari had a complex relationship with Masamune. In 1595, he suddenly left the Date clan and became a ronin, spending time serving under Toyotomi Hideyoshi and Tokugawa Ieyasu before returning to Masamune's service after the Battle of Sekigahara in 1600. He devoted his later years to the development of the Sendai domain and authored the "Shigenari-ki," recording the chronicle of Date Masamune's life.

In his connection to swords, Shigenari valued practical swordsmanship befitting a Sengoku warrior, and is said to have been involved in the appraisal and collection of famous swords alongside Masamune.