He was also a sword craftsman of the first rank, which was rather unusual for the feudal lords, and studied under a master craftsman Munemitsu OSAFUNE and left some excellent swords for coming generations.
大名にしては珍しく刀工としても一流で、名工・長船宗光に師事したと言われ、後世に幾つかの名刀を残している。