Salome I (ca. 65 BCE – ca. 10 CE) was the sister of Herod the Great and the mother of Berenice by her husband Costobarus, governor of Idumea.
Salome's second husband was Alexas Helcias, a gentleman of Herod's. She had three children by Costobarus, Antipater IV (who married Cypros II, Herod's daughter by Mariamne I), Berenice A (who married first Aristobulus IV, Herod's son by the same mother, and second Theudion, brother of his first wife Doris) and an unnamed daughter (who married Alexas' son Alexas, the Temple Treasurer).
Berenice's children were Herodias, Herod Agrippa I, king of Judea, Herod of Chalcis and Aristobulus Minor, and Mariamne III (who may have been the first wife of her uncle, Herod Archelaus, ethnarch of Judea).
Upon the death of Herod the Great in 4 BCE, she was given a toparchy including the cities of Iamnia, Azotus, Phasaelis, and 5000 drachmae. The Roman emperor Augustus supplemented this with a royal habitation at Ashkelon. While nominally queen of these areas, they were ultimately subject to the Judaean prefect.
After Salome's death, Iamnia fell to Livia, the future Roman empress, and then to her son Tiberius.