The Hall of the Kings lay within the White Tower, and that tower was first raised in III 1900 by King Calimehtar, so this is the earliest date that the Hall could have existed. Nearly eight centuries later, in III 2698, the White Tower was rebuilt by Steward Ecthelion I. It is at least possible, then, that the Hall of the Kings was made at this later date, but there are reasons to think that it in fact it survived through this rebuilding in its original form.
Notably, the Hall of the Kings contained a royal throne, which was not used by the Stewards, implying that it dated back to the days of when Gondor was ruled by a King. At the time that Ecthelion rebuilt the White Tower, the line of Kings had ended long ago, and so it seems implausible that the Steward would have reconstructed such an elaborate throne. Nonetheless, there was a hope among the people of Gondor that a King would one day return, so it is not perhaps absolutely impossible that Ecthelion might have made such a royal throne despite the fact that, so far as he could know, it would never be used.
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