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In page Nedumkotta:

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The fortification was constructed during the regime of Rama Varma Raja, popularly known as Dharma Raja of Travancore, and under the direct guidance and supervision of the then Prime Minister, Ayyappan Marthanda Pillai, and the then Commander of the Travancore Army, the Dutch Captain D'Lenoy. This historic defence line was comparable to the Great Wall of China except that the latter was more ancient and greater in length. It was under the protective cover of this Nedumkotta that a small army of Travancoreans under the command of Raja Keshavadas defeated and frustrated near Alwaye a formidable army led by Tipu Sultan.