" Háma knelt and presented to Théoden a long sword in a scabbard clasped with gold and set with green gems"

— The Two Towers, The king of the Golden Hall

Herugrim was an ancient sword that belonged to Théoden. He had entrusted the blade to Gríma Wormtongue for "safekeeping", but Gríma hid it away and allowed it to rust. When Gandalf restored Théoden to power, the sword was renewed as well. In The Two Towers (film) it is adorned with two gleaming horses' heads touching noses above the grip; the book describes it as "a long sword in a scabbard clasped with gold and set with green gems." Note that Theoden wields Herugrim in his left hand in the films.