The monumental Jerusalem dam anticipates the greatness of the city, already placing it in the time of the biblical kings Josiah and Amaziah. It provides a historical framework for the biblical accounts.

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The biblical kings really knew what they were doing.

The latest archaeological discovery in Jerusalem is among the most imposing and tells a story of foresight and advanced engineering, capable of strengthening the image of a biblical kingdom, vibrant and organized as early as the 9th century BC.

Exactly as described in the Old Testament.

 

The Jerusalem Dam Built by the Biblical Kings

At the center of the excavation, a monumental dam wall, about 12 meters high and more than 8 meters thick, now fully uncovered and precisely dated to a period between 805 and 795 BC. It is the largest in the entire region.

The decisive contribution came from a study just published in the peer-reviewed journal of the National Academy of Sciences, which revealed the results of the radiocarbon dating carried out by the Weizmann Institute of Science on some straw fragments found in the dam’s concrete.

The rapid degradation of this organic material ensured a reliable chronology, an approach that required extreme care in sample selection.

It is precisely this scientific precision that pushes back the beginning of Jerusalem’s greatness by over a century, placing it already in the times of the biblical kings Josiah and Amaziah, even before the reign of Hezekiah.

The historical existence of King Hezekiah was confirmed in 2015 with the discovery of a royal seal bearing his name.

 

Defense of the City from Floods and Enemies

The climatic scenario of the time completes the picture: Dead Sea sediments and stalagmites from the Soreq cave show a period marked by heightened aridity and brief but intense rainfall, capable of triggering sudden floods.

It was already known, for example, the famous “Tunnel of Hezekiah”, built around 700 BC to channel water from the Gihon spring to the Pool of Siloam.

The imposing dam in the lower part of Jerusalem and the related canals built by the biblical kings clearly responded to these natural elements: sophisticated water systems to contain floods and ensure water supplies in times of scarcity.

A discovery, as we said, that confirms the numerous biblical passages referring to such constructions.

In the Old Testament, for example, King Hezekiah and his feats are mentioned, citing precisely the «construction of the reservoir and the aqueduct to bring water into the city» (2 Kings 20:20).

In another biblical book, reference is made to his ability to «block all the springs and the stream that flowed through the center» of Jerusalem to prevent the siege of the Assyrian kings (2 Chronicles 32:2-4).

The presence of such infrastructure also indicates that the city possessed resources, technical expertise, and administrative capabilities until recently underestimated for that era.

Never before had a Jerusalem of the 9th century emerged so clearly as strong and projected towards the future.

 

The Biblical Kings Who Built the Dam

The discovery urges historians and archaeologists to review bibliographic sources and learn more about the rulers preceding Hezekiah.

The dam, say the authors of the discovery, may have been begun under the reign of Josiah and completed under the biblical king Amaziah, or entirely built by one of them. In any case, it promises new lines of research and, perhaps, new findings to bring to light.

This discovery adds a new piece to an already complex mosaic: Jerusalem of the Iron Age was not only a religious center but also a major administrative and technological hub.

 

Within those stones is enclosed a civilization that knew how to build monumental works to protect itself from the environmental challenges of the time and to defend Jerusalem from its enemies, an image that matches the one in the historical books of the Bible.

An archaeological discovery that therefore once again provides a historical framework to the Old Testament chronicles, often considered legendary.