Herugrim was an ancient sword, an Honour of the royalty in Rohan. It is at least five hundred years old. It was at last passed to Theoden, the last king of the second line of kings in Rohan; who won victory with it at Helm's Deep, and died with it in his hand on Pelennor Fields, outside of Minas Tirith, while aiding Elessar in his plight.
More from The Lord of the Rings: The Two Towers (2002)