Oath (disambiguation)

An oath is a vow by word of mouth.
Oath may refer to:
*Oath of Fëanor - The oath taken by Fëanor and his sons in the city of Tirion, swearing in the name of Ilúvatar to never rest until the three Silmarils were in their hands again.
*Oath of Cirion and Eorl - The oath that the Northmen King Eorl swore to the Steward of Gondor after Cirion gave him and his people Calenardhon to dwell in, in return for coming to Gondor's aid at the Battle of the Field of Celebrant. King Éomer and the new King of Gondor, Elessar, later renewed this oath of alliance, and reaffirmed Cirion's grant of Calenardhon to the Rohirrim. 
*In the Second Age Isildur brought with him a three meter tall stone as a symbol of his lineage and Gondor. He set it on the hill of Erech. He made the local hill tribes swear an oath of loyalty on the stone. The hill tribes broke their oath and were doomed never to rest until the oath was fulfilled. At the end of the Third Age, the heir of Isildur, Aragorn II, came to Erech to hold them to their oath again. This time they held true to it and formed the Host of the Dead and helped Aragorn fight the Corsairs of Umbar at Pelargir. (in the movie they fought at the Battle of the Pelennor Fields).