Perched high on a 25-foot defense rampart at Beerangi Medu near the eastern gate (Keelavasal) of Thanjavur Fort, the Rajagopala Swamy Beerangi stands as one of India's most extraordinary military monuments. Cast during the golden age of the Thanjavur Nayak dynasty, this massive forge-welded iron cannon is celebrated globally as one of the largest early modern cannons ever produced, serving as a powerful symbol of 17th-century South Indian military architecture and metallurgical engineering.
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| Thanjavur Cannon Tamil Nadu en.wikipedia.org |
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| Thanjavur Cannon Tamil Nadu facebook.com |
Historical Origins and Royal Commission
The cannon was commissioned around 1620 CE during the reign of King Raghunatha Nayak (1600–1645 CE), one of the most prominent rulers of the Thanjavur Nayak kingdom. Cast at nearby Kollumedu, the artillery piece was strategically mounted on the fort’s eastern bastion to guard the main entrance against invading forces. According to local lore and historical records, the weapon was crafted through sophisticated forge-welding techniques, combining native Tamil iron-working expertise with technical collaboration from Danish gunsmiths stationed at Tranquebar (Tharangambadi).
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| Location map Thanjavur google.com |
Metallurgical Marvel and Engineering Specs
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| Thanjavur cannon. insa.nic.in |
The physical dimensions of the Rajagopala Swamy Beerangi reflect the extraordinary scale of Nayak military design:Dimensions & Weight: Measuring roughly 26 feet in length and weighing over 22 tonnes, it ranks among the largest historic cannons in the world.
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| Thanjavur Cannon karnatakatravel.blogspot.com |
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| Thanjavur Beerange (cannon)Thanjavurtourism.com |
Forge-Welded Construction: Unlike cast bronze cannons, it was built by forge-welding iron components—utilizing an inner core of 43 longitudinal iron staves bound together by 94 outer iron rings.
Corrosion Resistance: Despite centuries of direct exposure to sun, rain, and coastal moisture, the weapon exhibits remarkable resistance to atmospheric rust, showcasing advanced iron-purification techniques similar to the Delhi Iron Pillar.
Firepower: Engineered to defend the fort against heavy sieges, it was capable of firing solid iron cannonballs weighing up to 1,000 kilograms over long distances.
Heritage and Preservation Challenge Named after the regional deity Rajagopala Swamy—and locally referred to as Daasimettu Beerangi—the cannon is officially declared a monument of national importance under the Archaeological Survey of India (ASI). Beyond its military utility, it reflects how the Thanjavur Nayaks successfully integrated formidable artillery with fort architecture to secure the fertile Kaveri delta.Today, local heritage organizations like INTACH actively work to raise public awareness and advocate for the restoration of Beerangi Medu. The Rajagopala Swamy Beerangi remains a testament to the scientific ingenuity, defense strategy, and monumental ambition of Tamil Nadu’s Nayak era.
https://navrangindia.blogspot.com/2020/03/thanjavur-cannon-rajagopalaswami_6.html
INTACH (Indian National Trust for Art and Cultural Heritage - Thanjavur Chapter): Field reports on Nayak-era fortifications and forge-welded metallurgical heritage.
Historical accounts detailing the reign of King Raghunatha Nayak (c. 1600–1645 CE) and 17th-century metallurgical collaboration with Danish armorers at Tranquebar (Tharangambadi).
K. N. Jayaraman (Author: navrangindia.blogspot.com )
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