Sauron begins to build the Barad-dûr
Event Type: Military/Strategic
Age: 2nd Age - Pre-Rings
Sauron, alarmed by the growing power of the Númenóreans, chooses Mordor as a land to make into a stronghold. He begins the building of Barad-dûr.
The Lord of the Rings, Appendix B, The Tale of Years: The Second Age
Already in the days of Tar-Minastir, the eleventh King of Númenor, [Sauron] had fortified the land of Mordor and had built there the Tower of Barad-dûr....
The Silmarillion, Akallabêth
[In] his ancient kingdom of Mordor beyond the Ephel Dúath, the Mountains of Shadow... above the valley of Gorgoroth was built his fortress vast and strong, Barad-dûr, the Dark Tower....
The Silmarillion, Of the Rings of Power and the Third Age
'[The Dark Tower's] foundations... were made with the power of the Ring, and while it remains they will endure.'
The Fellowship of the Ring, LoTR Book 2, Ch 2, The Council of Elrond
Elena Tiriel 20Sep10