|!||The title of this article is conjectural.|
While the content of this article is based on official information, the actual name of the subject remains pure conjecture, and is yet to or cannot be officially named.
The Conquest of Rhûn was the last event of the First Easterling War and the first expansion of Gondor's power.
After King Turambar defeated the Easterlings on the field in TA 541 avenging his father's death, Turambar led Gondor's armies deep into Rhûn past the Sea of Rhûn. All the lands east of Dagorlad, south of the realm of Rhovanion, north of the Ash Mountains, and west of the Sea of Rhûn fell to the might of Gondor. The conquest was complete by TA 550 and marked the foundation of the East-lands.
Whether this meant Gondor ruled over Easterlings or subjugated them is not known only that these new eastern territories became a province of the Kingdom of Gondor. It is possible that the Easterling population was expelled from the territory and forced further east where they continued to live, as there is no mention of Easterlings being subjected by Gondor in the East-lands. This seems likely since new tribes of Easterlings, organized and still hostile to Gondor would appear though it would be nearly 800 years later.