All those Julias...

The backbone of the Severan clan ran through its women, all of whom were called Julia.

                                                                                                          Bassianus
                                                                                                                 |
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                                             |                                                                                                                                                |
Septimius Severus = Julia Domna                                                                                                                                 Julia Maesa
                            |                                                                                                                                                                 |
      -------------------------------------------                                                                                 --------------------------------------------------------------------------
     |                                                   |                                                                              |                                                                                          |
Caracalla = Plautilla                    Geta                                                               Julia Soaemias                                                                       Julia Mamaea
                                                                                                                                       |                                                                                              |
                                                                                                                             Elagabalus = (1) Julia Paula                          Orbiana = Severus Alexander
                                                                                                                                                   (2) Aquilia Severa
                                                                                                                                                   (3) Annia Faustina