Daishō

With the advent of the katana, the wakizashi eventually was chosen by samurai as the short sword over the tantō.

He mentions the custom of leaving the katana at the door of a castle or palace when entering while continuing to wear the wakizashi inside.

[8] Daishō may have become popular around the end of the Muromachi period (1336 to 1573)[4] as several early examples date from the late 16th century.

However, in the first half of the 17th century, the famous swordsman Miyamoto Musashi promoted the use of a one-handed grip, which allowed both swords to be used simultaneously.

This technique, called nitōken, is a main element of the Niten Ichi-ryū style of swordsmanship that Musashi founded.

Daishō style sword mounting, gold banding on red-lacquered ground. 16th century, Azuchi–Momoyama period . Important Cultural Property . Tokyo National Museum .
Daishō mountings with ice crack pattern design. Edo period , Designated as Important Mounting , The Japanese Sword Museum
Daishō style handachi "half tachi " sword mounting, silver stream design on green lacquer ground. 16th–17th century, Azuchi Momoyama－Edo period. Tokyo National Museum.
Daishō for formal attire with black scabbard, hilt winding thread and white ray skin hilt, which were regulated by the Tokugawa Shogunate. Daishō owned by Uesugi clan . Late Edo period.