Feanor had seven sons who swore the Oath of Feanor with him after the Darkening of Valinor and before they left in pursuit of Morgoth. In Middle Earth, his son Maedhros ruled from his fortress in Himring. Celegorm and Curufin fortified the Pass of Aglon, while Maglor lived around the River Gelion. Caranthir lived on the lands between the river Gelion and the Blue Mountains, while the twins Amrod and Amras lived closer to their elder brother Meadhros.