Aldburg (OE. 'Old Fortress') was one of the oldest settlements of Middle-earth, in Rohan. It was recorded to have been built by Eorl in the region known as the Folde, some miles to the southeast of Edoras. Though he and his family moved to Edoras early in Rohan's history, Aldburg remained a seat of noblemen. At the time of the War of the Ring, it was the home of King Théoden's nephew Éomer, who was Third Marshal of the Mark, and heir of the Kingship of Rohan himself. In the Lord of the Rings book-series, Aldburg is never referenced to, and doesn't appear on the maps.