In J. R. R. Tolkien's fictional world of Middle-earth, the House of Eorl was the family descended from Eorl the Young that ruled Rohan.

      *Eorl the Young                               * First line
        |                                           † Second line
     *Brego                                         ‡ Third line
   _____|_____
  |           |
Baldor      *Aldor
     _________|__
    |            |
3 daughters   *Fréa
                 |
            *Fréawine
                 |
            *Goldwine
                 | 
              *Déor
                 |
              *Gram
         ________|_______
        |                |
*Helm Hammerhand       Hild
                         |
                     †Fréalaf Hildeson
                         |
                   †Brytta Léofa
                         |
                      †Walda
                         |
                      †Folca
                         |
                     †Folcwine
         ________________|______________            
        |          |        |           |
     Fastred    Folcred   daughter   †Fengel
                                    ____|________
                                   |             |
                             2 daughters    †Thengel = Morwen Steelsheen
         ____________________________________________|___             
        |            |                    |              |
     daughter   †Théoden = Elfhild    2 daughters   Théodwyn = Éomund
                         |                                   |
                     Théodred                                |
                              _______________________________|___
                             |                                   | 
               Lothiriel = ‡Éomer                    Faramir = Éowyn
                         |                                   |
                     ‡Elfwine                             Elboron
                                                             |
                                                          Barahir