How a medieval Sri Lankan kingdom mastered water to achieve total self-sufficiency
In short: Polonnaruwa was once a thriving medieval capital where engineering brilliance turned the landscape into a self-sustaining powerhouse. From its origins as a military outpost to its peak under Parakramabahu the Great, the city’s sophisticated irrigation systems remain a testament to a civilization that refused to waste a single drop.
Polonnaruwa, the second-oldest kingdom in Sri Lanka, began as a Sinhalese military post before undergoing a dramatic transformation under the Chola dynasty in the 10th century. Renamed Jananathamangalam, the city became a provincial seat of power, marked by the construction of significant Hindu architecture, such as the Shiva temple Vanavan Mahadevisvaram, built by Raja Raja Chola I. This period of foreign governance ended in 1070 AD, when Vijayabahu I, also known as Vijayabahu the Great, successfully besieged the city after a complex three-front military campaign.
The city reached its zenith under King Parakramabahu the Great, the grandson of Vijayabahu I. His reign was defined by an uncompromising commitment to agricultural productivity and water management. He famously insisted that no rainwater should be squandered, leading to the creation of irrigation networks that surpassed those of the earlier Anuradhapura period. The most monumental of these was the Parakrama Samudra, or 'Sea of Parakrama,' a massive reservoir that served both as an agricultural lifeline and a hub for sea-going vessels connected via the Mahaweli River. Under his leadership, the kingdom achieved complete self-sufficiency.
The decline of Polonnaruwa was as swift as its rise. Following the reign of Nissankamalla I, the court became fractured by internal conflict and increasingly reliant on matrimonial alliances with South Indian dynasties. This political instability eventually eroded the local royal lineage, culminating in a devastating invasion by the warlord Kalinga Magha in 1214. The subsequent destruction by fire left the metropolises of Anuradhapura and Polonnaruwa in ruins. Today, the site is a UNESCO World Heritage site, inhabited by toque macaques and serving as a historical window into a sophisticated past.
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Sources
- Summary by Intellect · source: Polonnaruwa
- Also: Wikidata — Polonnaruwa · CC0
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