Chiyoganemaru

Chiyoganemaru is a tachi passed down through generations by Ryukyuan Kingdom monarchs, occupying a uniquely significant position among Japanese swords as a National Treasure with Ryukyuan provenance. The blade measures approximately 72 centimeters in length, is unsigned with flat-surface construction (hirazukuri), transmitted under the name "Chiyoganemaru," and bears the characters "大世" carved on the pommel. The name "Chiyoganemaru" is interpreted in Ryukyuan tradition as meaning "eternal golden circle." The hamon is founded on a quiet straight temper line (suguha), with fine, calm nie pervading the entire hardened zone. The jigane exhibits tightly packed itame grain in dignified refinement. Regarding the sword's origin, scholarly opinion remains divided: some attribute it to the Yamato tradition, while others ascribe it to smiths who flourished in Ryukyu itself, and discussion continues among researchers. Throughout the era of Shō dynasty rule over the Ryukyuan Kingdom, this blade was treasured as a symbol of royal authority, and after surviving the Satsuma invasion of Ryukyu in 1609, it continued to be transmitted as a precious sword. Following the Meiji Restoration, the blade was transferred to mainland Japan and is now held by the Naha City Museum of History, designated a National Treasure as part of the "Ryukyuan Royal Shō Family-related Materials" collection. Its unprecedented history as a Japanese sword that served as the emblem of Ryukyuan royal authority further elevates its significance as a singular presence in Japanese sword history.