La Porte Noire

[aravanessë]

Dans HoMe XII:

Narmakil II. born 1684 lived 172 years +slain 1856.
In his time it is said that the Ulairi or Ringwraiths re-entered
Mordor, owing to the ceasing of the vigilance, and there they
secretly prepared in the darkness for the return of their Dark
Lord. Men out of the East appeared of a new sort, stronger,
better armed, journeying in huge wains, and fighting in chariots.
Stirred up maybe by Sauron they made a great assault on
Gondor, and continued to be a great peril for very many years.
Narmakil was slain in battle with their host beyond Anduin,
north-east of the Morannon.

Mais cela ne dit toujours aps qui l'a construite... Mais jamais avant l'arrivée des Nazgul il n'est question de la Porte Noire, je serais plus partisant de l'hypothèse uniquement "sauronienne".
aravanessë