Gondor's northeastern border withdrawn to the Emyn Muil (estimated date)
Event Type: Political
Age: 3rd Age - The Kings
After the death of Atanatar the Glorious the Northmen of Mirkwood and the Upper Anduin, who had increased much in the peace brought by the power of Gondor, became powerful. Though these people were ultimately related in speech and blood to the Atani (and so to the Numenoreans), and were usually friendly, they now became restless. [Rómendacil] was forced to withdraw his northern border east of Anduin to the Emyn Muil. He there built the Gates of Argonath ... beyond which no stranger was allowed to come south without leave.
The Peoples of Middle-Earth, HoME Vol 12, Part 1, Ch 7, The Heirs of Elendil: The Southern Line of Gondor: The Anárioni
[Note: the date is an estimate, set to follow the event Minalcar Defeats the 3rd Invasion of Gondor by Easterlings.]
Elena Tiriel 16Oct05