Shakiko Masamune is the third and last wife of the immortal, Juan Sanchez Villa-Lobos Ramirez, whose sword, a katana, was given to him in 593 B.C., as a gift from his father-in-law, Masamune.
Ramirez said it was the only one of its kind, "...like his daughter." He advised Conner MacLeod to leave his mortal wife, Heather, because "When Shakiko died, I was shattered. I would save you that pain."