Third Age 2510
 Within this year
- 10 Cirion sends the first messengers to the Éothéod.
- 25 Borondir delivers Cirion's plea for help to Eorl the Young.
 March - April
- 6 Eorl the Young and his éoherë set out for Gondor.
- 15 Eorl the Young wins the victory of the Field of Celebrant.
- The oaths of Cirion and Eorl the Young are spoken; Calenardhon is ceded to the Éothéod and becomes the Kingdom of Rohan.
- Eorl the Young returns to the North; he brings the Rohirrim to settle in Calenardhon.