Grimbold
From the One Wiki to Rule Them All, the Lord of the Rings Encyclopedia.
Grimbold was a Rohan commander. He led the Riders of Rohan during the First Battle of the Fords of Isen along with Elfhelm and Théodred and killed many orcs. Soon he had to retreat due to the death of Théodred.
Later in The War of The Ring he led a company at Pelennor Fields until he was slain by Orcs.

