Its building took six hundred years to complete (S.A.1000-1600); it was the greatest fortress ever built since the Fall of Angband, and much of Sauron's personal power went into it.
Its building took six hundred years to complete (S.A.1000-1600) and it was strengthened by the power of the Ring. It was the greatest fortress ever built since the Fall of Angband, and much of Sauron's personal power went into it.