Olympias the Herodian was the daughter of Herod the Great and his wife Malthace, a Samaritan. This was Herod's fourth marriage. Olympias' better known brothers were Herod Archelaus and Herod Antipas. She married Herod's nephew Joseph ben Joseph and bore him a daughter, Mariamne, who was the first wife of Herod of Chalcis. http://en.wikipedia.org/wiki/Olympias_(Herodian)

Olympias

Olympias the Herodian was the daughter of Herod the Great and wife Malthace, a Samaritan. This was Herod's fourth marriage. Olympias' better known brothers were Herod Archelaus and Herod Antipas. She married Herod's nephew Joseph ben Joseph and bore him a daughter, Mariamne, who was the first wife of Herod of Chalcis.

Source :

https://en.wikipedia.org/wiki/Olympias_(Herodian)