The Horn of Rohan, also known as the Horn of the Mark, was a gift from Éomer and Éowyn to Meriadoc Brandybuck. Éowyn presented it to him when he was leaving Rohan for his deeds at the Battle of the Pelennor Fields. It was an ancient, dwarf-made horn of silver, engraved with horsemen riding in a line from the tip to the

mouth. Runes were set into it that gave it the ability to cause enemies fear and friends joy, bringing the blower's friends to him. Its baldric was green. The horn was an heirloom of the royal house of Rohan, brought from the North by Eorl the Young. It was originally from the hoard of the dragon Scatha the Worm.

Merry uses the horn when rousing the Hobbits of Bywater when he, Frodo Baggins, Peregrin Took, and Sam Gamgee arrive back in the Shire after the War of the Ring. He also blows it in Hobbiton when the four of them go to see Lotho Sackville-Baggins. Every year after that, the horn was blown on November 2; the anniversary of its first being blown in the Shire, and this was followed with bonfires and feasting in Buckland.