Kings of Uí Chremthainn and Fernmag
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["d." and "k." abbreviate "died" and "king of" respectively.]
                        Crimthann, fl. fifth century
                        ancestor of Uí Chremthainn
                            |
                        Eochu [or Eochaid]
                        [king of Airgialla?]
                            |
                        Cairpre Daim Argait, d. 514
                        king of Airgialla
                      ______|________________________________
                     |                                       |
                  Daimíne, d. 566                         Nadsluaig
   __________________|____________________                   |
  |                  |                    |                  |
Tuathal            Conall              Luachán            Fergus
  |                d. 609                 |                  |
  |                                       |                  |
Tuadan                                 Fergus             Crónán
  |                                       |                  |
  |                                       |                  |
Máel Dúin                              Máel Dúin          Máeldub
  |                                    [d. 641?]             |
  |                                       |                  |
Tuathal                                Máel Fothartaig    Máel Fothartaig
  |____________________                   |               d. 697, k. Airgialla
  |                    |                  |                  |
Cellach, d. 732,    Ailill, d. 739     Eochu Lemna        Aithechda
k. Uí Chremthainn   k. Uí Chremthainn     |                  |
  |                        _______________|                  |
  |                       |               |                  |
Colgu, d. 781          Dub Thíre       Fergal, d. 722     Artri, d. 742
k. Uí Chremthainn         |            k. Tamnach         k. Uí Chremthainn
                          |                                  |
                       Eochaid                            Máel Fothartaig
                __________|                               d. 791
               |                                             |
             Cathal, d. 791                               Ruaidrí, d. 833
             k. Uí Chremthainn                            k. Uí Chremthainn
   ____________|___________                    ______________|___________________
  |            |           |                  |              |         |         |
Cumuscach   Congalach   Muiredach, d. 867    Braen      Fogartach   Bruatur   Cairell
d. 827, k.  d. 827      k. Uí Chremthainn    d. 850.    d. 850      d. 850    d. 851
Airgialla                  |                 k. Uí           |                k. Loch
                           |                 Chremthainn     |                Uaithne
   ________________________|          _______________________|______________
  |                                  |                       |              |
Cumuscach, d. 878                 Donnacán                Flannacán      Máel Póil
k. Uí Chremthainn                 d. 882                  d. 887            |
  |                               k. Fernmag              k. Fernmag        |
  |                           _______|_________              |              |
  |                          |                 |             |              |
Máel Ruanaid              Fogartach         Lorcán        Máel Muire     Cerball
d. 914, toísech           d. 949               |          d. 914         ancestor of
of Síl Duib Thíre         k. Airgialla         |          k. Fernmag,    Ua Cerbaill
                             |                 |          rígdamna of       |
                             |                 |          Airgialla         |
                             |                 |             |              |
                          Laidcnén          Críchán       Donnacán       Laidcnén
                          ancestor of          |          d. 970         d. 988
                          Ua Laidcnén          |          k. Airgialla   k. Fernmag
                             |                 |                            |
                          Muiredach         Cairell                      Mathgamain
                             |                 |                         d. 1022
                             |                 |                         k. Fernmag
                             |                 |                            |
                          Fogartach         Mac Léiginn                  Domnall
                             |              d. 1022                         |
                             |              k. Airgialla                    |
                          Lethlobur         & k. Fernmag                 Cú Caisel
                          Ua Laidcnén                                    Ua Cerbaill 
                          d. 1078                                        d. 1123
                          k. Airgialla                                   k. Airgialla
                                                                         & k. Fernmag
                                                                            |
                                                                         Muirchertach
                                                                         Ua Cerbaill
                                                                         d. 1125,
                                                                         k. South Fernmag