Tenbun Era

The Tenbun Era (1532–1555) occupies the middle Sengoku period, when sword-making techniques reached supreme refinement. Simultaneously, the arrival of Portuguese firearms in 1543 began to transform tactics and weaponry fundamentally, making this an era of twilight for the old order and dawn of the new.

### Master Smiths and Their Masterworks

Tenbun represents the peak of second-generation Muramasa, whose blades earned warriors' unshakeable confidence as "waza-mono" (skill-forged blades). Records from 1535 (Tenbun 4) document a Muramasa ō-katana used in an assassination that reportedly severed a body from shoulder to hip in a single stroke, attesting to the blade's formidable practical utility.

The Izumi-no-Kami Kanesada lineage saw its third generation flourish, with the smith known as "Hiki-Sada." The first generation of Yamato Kanabo, though producing swords of somewhat inelegant form, were highly prized by Sengoku warriors for their superior strength and cutting ability.

In the Sōshū tradition, the sixth-generation direct disciple of Masahiro was invited by Hōjō Ujitsuna to establish the Tsunahiro lineage, laying foundation for the subsequent flourishing of Sōshū-den.

### Historical Context

The Tenbun period saw the rise of warlords including Oda Nobunaga, Takeda Shingen, and Uesugi Kenshin—an age when the relationship between firearms and swords was fundamentally questioned. Yet smiths continued to forge swords of the highest caliber, blending martial utility with aesthetic beauty.