In the "Gikeiki Chronicles", "Ima no Tsurugi" sword, a Japanese short sword of 19.7 cm in lengh, was used by MINAMOTO no Yoshitsune in killing himself.
今剣（いまのつるぎ）とは、『義経記』で源義経が自刃に用いたことになっている刃長6寸5分の日本刀（短刀）。