מלכים ב, פרק כ״א, פסוק י״ח

The end of Manasseh's reign marks a clear break from the long-standing burial traditions of the Davidic dynasty. Rather than being laid to rest in the traditional tombs of the kings, he was buried on his own private property [ביאור שטיינזלץ]. He was placed in a garden located directly within the grounds of his personal home [מצודת דוד], a space simply known as the garden of Uzza [מצודת ציון].

This choice of an alternative, private burial plot carried deep significance. By establishing a completely separate cemetery for himself, Manasseh may have been attempting to present himself as the founder and initiator of an entirely new royal line [ביאור שטיינזלץ].