15 June 2025 The Future is the Product of the Past

2.3-meter sword found in 4th-century tomb in Japan

The largest bronze mirror and the largest “dako” iron sword in Japan were discovered at the Tomio Maruyama burial mound in Nara.

Experts say the twin discoveries from the Tomio Maruyama Tumulus last November can be classified as national treasures, with the shield-shaped mirror being the first of its kind.

The Nara Municipal Buried Cultural Properties Research Center, which excavates and researches Tomiomaruyama kofun, and the Nara Prefectural Archaeological Institute of Kashihara, which assists in the excavation, announced the discoveries on Jan. 25.

The 2.3-meter sword with a meandering blade is also the largest iron sword made in that period in East Asia.

The patterned surface of the mirror carries the designs of two more common “daryu” mirrors, distinctive with its designs based on imaginative creatures, which have been found mainly in western Japan.

A team from Nara Prefecture examine the dakō iron sword found in the Tomio Maruyama burial mound. Photo: NARA CITY BOARD OF EDUCATION / KYODO

The shield-shaped mirror is 64 cm in length, 31 cm in width at most, and weighs 5.7 kilograms. Typically, bronze mirrors that are found at archaeological sites are rounded, but this one is shield-shaped.

The sword is the oldest of the dako swords, distinguished by their wavy, snake-like shapes, which give rise to their name. As burial goods, more than 80 other dako swords have been discovered throughout Japan.

The latest sword has markings of a sheath and handle, and together, its length measures 2.6 meters, more than dominating the last longest dako sword discovered at around 85 cm.

“(These discoveries) indicate that the technology of the Kofun period (300-710 AD) are beyond what had been imagined, and they are masterpieces in metalwork from that period,” said Kosaku Okabayashi, the deputy director for Nara Prefecture’s Archaeological Institute of Kashihara.

A shield-shaped mirror discovered at the Tomio Maruyama burial mound in Nara | NARA CITY BOARD OF EDUCATION / KYODO
A shield-shaped mirror discovered at the Tomio Maruyama burial mound in Nara | NARA CITY BOARD OF EDUCATION / KYODO

Mirror and shields are considered to be tools to protect the dead from evil spirits. The sword is thought to have been enlarged to increase its power, and the possibility of its use as a battle tool is low, researchers said.

The 109-m-diameter Tomio Maruyama burial mound, the largest in Japan and dating to the late 4th century, is believed to have belonged to a significant person who supported the Yamato rulers at the time.

The burial chamber where the discoveries were made is thought to have belonged to someone close to that person, according to Naohiro Toyoshima, an archaeology professor at Nara University. He also said that the ritualistic sword and the shield-shaped mirror may indicate that the individual was involved in military and ritualistic matters.

Cover Photo: Photo taken on Dec. 5, 2022, shows a sword discovered at the Tomio Maruyama burial mound in Nara, western Japan. (Photo courtesy of Nara city board of education)(Kyodo)

Related Articles

After 85 years of adventure, Globetrotting Mycenaean gold ring returns home

3 June 2022

3 June 2022

The 3,000-year-old gold Mycenaean ring, stolen from the Rhodes Archaeological Museum during World War II and later bought by a...

3500-year-old ceramic oven discovered in Turkey’s Tepecik Mound

24 August 2021

24 August 2021

A 3,500-year-old ceramic oven was unearthed in Tepecik Mound in the Çine district of Aydın, in western Turkey. Tepecik Höyük,...

“Exceptionally rare” gold sword pommel given to Scottish national museums

24 October 2022

24 October 2022

An “exceptionally rare” solid gold sword pommel found by a metal detectorist near Blair Drummond, Stirling, has been acquired by...

Study Reveals Córdoba’s Advanced Sanitation System: A Medieval Model Unmatched in Europe for Centuries

25 April 2025

25 April 2025

Recent research has unveiled the impressive sanitation systems of medieval Córdoba, revealing that the city’s infrastructure was so advanced that...

A 2700-year-old collection of more than 60 bronze and iron objects found in Bükk in northwestern Hungary

2 October 2024

2 October 2024

An excavation project led by a university team specializing in the Bronze and Iron Ages in Bükk in northwestern Hungary,...

Women buried with thick twisted bronze neck rings and buckets on their feet found in Ukraine

20 January 2024

20 January 2024

Archaeologists discovered the remains of men buried with weapons such as axes, spearheads, and swords, and women buried with thick...

Two Archaic Sculptures was Unearthed in Milas Euromos 2021 Excavations

2 July 2021

2 July 2021

Milas Euromos 2021 archaeological excavations continue. During the excavations of Milas Euromos 2021, archaeologists unearthed two archaic period statues (kuros)...

Important archaeological find in the seas of Sicily: Archaic stone anchors found off Syracuse

24 November 2023

24 November 2023

During a joint operation by the Maritime Superintendency of the Sicilian Region and the Diving Unit of the Guardia di...

Farmer Found an Ice Age Cave Under His Field

30 March 2021

30 March 2021

A naturally formed cave was found near the town of Kraśnik in southeastern Poland, used by humans during the Ice...

Ritualistic Dog Burials Associated with the Goddess Gula Unearthed at the Harran Archaeological Site in Southeastern Türkiye

15 December 2024

15 December 2024

Excavations at the Harran archaeological site in Şanlıurfa, one of the world’s oldest settlements and listed on UNESCO’s Temporary World...

The place where John the Baptist was martyred

4 February 2022

4 February 2022

The infamous birthday banquet of Herod Antipas, which culminated in the beheading of St John the Baptist — a preacher...

9th-Century Slave-Built Large-Scale Agricultural System Discovered in Southern Iraq

3 June 2025

3 June 2025

A recent archaeological study has unveiled compelling evidence of a vast agricultural infrastructure in southern Iraq, believed to have been...

Elite Roman man buried with a silver crossbow brooch, first of its kind found in Wales

15 July 2023

15 July 2023

Archaeologists in Wales have made an intriguing discovery near a Roman villa. They have discovered the skeleton of a man...

The ruins found in Nara could be the Imperial House of Female Emperor Koken

1 July 2021

1 July 2021

Archaeologists unearthed one of the largest building remains ever found at the former site of the Heijokyu palace in the...

Egypt unearths 2,300-year-old remains of Greco-Roman town in Alexandria

28 August 2021

28 August 2021

An Egyptian archeological team discovered the ruins of a Greco-Roman residential and commercial town in the north coast city of...