Rhudaur (Sindarin for "Eastern Forests") is the name of one of the three kingdoms into which Arnor was divided in T.A. 861 (the other two being Arthedain and Cardolan). True to its name, Rhudaur was the easternmost division of what was once Arnor, and included most of what is now the Trollshaws (west of the River Bruinen) and much of the Lone-lands. The Weather Hills and the Tower of Amon Sûl were highly desired by Rhudaur, whose inhabitants tried to take them by force repeatedly from Arthedain and Cardolan, both of whom also claimed the site as their own.
Unlike its sister states of Arthedain and Cardolan, Rhudaur from the start had very few Dúnedain inhabitants, being mostly peopled by hill-men sympathetic to Angmar. It was not long before Rhudaur became a puppet state controlled by the Witch-king of Angmar, and in 1409 an invading force from Angmar destroyed the remaining Dúnedain and ended the kingdom.
The Lord of the Rings Online: Shadows of Angmar references several characters who have roots in Rhudaur:
- Ánraig - headed armies against the people of Arthedain